You didn't state what type of steering box that you purchased from CPP. Toyota and aftermarket control valve/ram type systems
operate on about 900 psi. GM Pumps produce about 1300 psi. Too much pump pressure may cause some of the problems you are experiencing.
There are kits available to reduce the pump pressure.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine