I agree with all of the above but don't rule out a defective replacement pump. As many have realized, some of the aftermarket stuff is just poor quality. There are several grades of bearings and many re-builders go with the cheapest components available.
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