Mechanical or electrical fuel pump
Nice pile of metal you got there lol.....
Seal the deal for yourself. Electric Intank with a return. You have spent the money on the motor so a little more won't kill ya....
Once I get a few miles on my 72 the Mechanical Pump is history and I will do an Intank and ,y powerplant will make way less power than you. I just think it eliminates a whole bunch of variables in older cars....
Good luck,
JW