Make sure you get your pitman arm situation figured out first. Later PS boxes had a larger diameter shaft and early pitman arms do not fit.This can be a challenge with an early b-body. If it's the smaller shaft you're good. Any advice on what pitman might work? If the new box has a small spline, same as you have now you're good. Use it. If it's the bigger spline then the problems begin. The pitman arm and idler arm need to match (same length and pitch) and your 65 uses a stud mount idler so later through bolt idler arms will not work. So your best bet is to make sure the splines match. Sorry I can't be of more help.
'64 Sport Fury, 528 Hemi, FiTech EFI, 4-speed, 4.10 Dana 60
'57 Belvedere 2dr sedan, current project in process
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'03 Ram 2500 CTD HO, 6-speed 214,000 miles and still going strong
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