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OK, the belts I run on my 77. And yes I can check my power steering fluid.
Gates green stripe belts, Alt. 7541. 11A1370
Power steering, 7365, 11A0925
These work and are top quality belts.
When I rebuilt the PS system on my 1975 coupe, I ground a small channel into the side of the pump bracket to help with removal of the dipstick, which was just about impossible to get out. I then realized the PO had installed the wrong belt.... too short. A longer belt moved the PS reservoir back a small amount and made a big difference in getting to and removing the PS reservoir cap. Be sure if you lengthen the belt and reposition the pump that you check the lines going to the PS control valve and hydraulic ram. Very tight under there and it's easy to have them scrape the underside of the car when the pump is moved.
There are 2 different brackets for that style see pic.The pickups from that era I believe up to 87 used the same setup.I can't see mine on my 72 but the cap clears to come straight off and it is an original numbers match car.If yours is out of adjustment and it is the short bracket need to look for the other one.From that diagram that is posted above it looks to me like it shows the long bracket.
Another option is to relocate the reservoir for the power steering fluid. I installed a "March" Serpentine conversion and it doesn't let you use the original style pump. Instead they suggested the use of a newer style power steering pump and hoses to attach it to a new reservoir.
After speaking to "Turn One" I had the parts I needed and they explained that this was one of the best things to do for the power steering system. Many power steering systems have very small liquid reservoirs and this means the fluid is used over and over it gets hot and this will cause the other parts to fail on the P.S. system. I installed a 1 quart reservoir and this reduced the temperatures in the P.S. system considerably. The hoses are all A/N style hoses made by me for the right length and the fittings to adapt to the pump were supplied by Turn One. Now I have a Power Rack and Pinion running nice and cool in my 1968 C3.