I have their PS mounting and a saginaw pump and had to run a shallow 18" flex fan but I have a Cold Case aluminum radiator to clear the pulley retained by the nut. My 340 stays at 180 idle so driving, so no issues.
So if you have a stock radiator you might be OK. The brackets do move the pump up a little which helped my high pressure line clear the 72-down K-member motor mounts. The CVF Brackets are the same for Serp vs V belt.
There are Saginaw pumps with a pressed on pulley from the mid 70's, I want to say look at 76 F-body pump. These should have more room as the pulley presses. Not sure if CVF makes a press on pulley.