As Jack Humphrey advises, to perform a rebuild of the components you mentioned, or any other components for that matter, you should study the GM Service/Overhaul manuals for your vehicle. Having said that, I will add the following:
The rebuild kits for the PS control valve, power steering cylinder, and power steering pump are not especially difficult to install. However, with particular respect to the valve and pump, there is a certain "art" to accomplishing a satisfactory rebuild. Also, these components have a high operating pressure, so even the slightest deficiency in the rebuild will result in a leak. The power steering control valve also requires a centering adjustment after rebuild. There are two ways to do this. First, if you have available a power steering valve test bench, you can center the valve off the car. This is the best way to perform this adjustment. Unfortunately, very few folks have such a device available to them outside of sophisticated rebuilders or OEM manufacturers. The second way to center the valve is on the car after installation. This can be very tricky and even somewhat dangerous, but it can be done if you follow the procedure found in the service manual. Expect to be frustrated, though, before it's all over.
The "wheel" you mention is, I believe, the power steering pump pulley. Corvette pumps from 1963-1974 used a pulley with a keyed, tapered shaft; 1975-1982 used a press-fit pulley. Both types, but especially the press fit, require the use of a special puller which affixes to the slotted hub of the stamped steel-type pulley. You can obtain these pullers from Kent-Moore, Snap-On Tools, and some others. You must use the special puller or risk destroying the pulley. The 63-74 "509" pulley is discontinued and very expensive. If your car uses a cast iron pump pulley, you may be able to get by with an alternate puller of some type. You still need to be careful, though. These pulleys are expensive, too.
The rebuild kits for the PS control valve, power steering cylinder, and power steering pump are not especially difficult to install. However, with particular respect to the valve and pump, there is a certain "art" to accomplishing a satisfactory rebuild. Also, these components have a high operating pressure, so even the slightest deficiency in the rebuild will result in a leak. The power steering control valve also requires a centering adjustment after rebuild. There are two ways to do this. First, if you have available a power steering valve test bench, you can center the valve off the car. This is the best way to perform this adjustment. Unfortunately, very few folks have such a device available to them outside of sophisticated rebuilders or OEM manufacturers. The second way to center the valve is on the car after installation. This can be very tricky and even somewhat dangerous, but it can be done if you follow the procedure found in the service manual. Expect to be frustrated, though, before it's all over.
The "wheel" you mention is, I believe, the power steering pump pulley. Corvette pumps from 1963-1974 used a pulley with a keyed, tapered shaft; 1975-1982 used a press-fit pulley. Both types, but especially the press fit, require the use of a special puller which affixes to the slotted hub of the stamped steel-type pulley. You can obtain these pullers from Kent-Moore, Snap-On Tools, and some others. You must use the special puller or risk destroying the pulley. The 63-74 "509" pulley is discontinued and very expensive. If your car uses a cast iron pump pulley, you may be able to get by with an alternate puller of some type. You still need to be careful, though. These pulleys are expensive, too.