Hey guys, thanks for your feedback, looks like safest bet is to use a new pump.
I have a couple of questions..
Staddy, do you have headers and if so, what brand. Any problem with the clearance between the headers and the box?
Ray68, I have a 351W with Performer manifold, Holly carb, headers and ICE ignition. Planning to add aluminum heads and cam. Also have FMX and 9 inch with 3.00:1 I might be looking for a similar setup to yours.
What carby are you running
Do you have a high stall converter
What diff ratio do you have
What size cam and at idle, can you easily hear that it has a performance cam.
Cheers