I been running Carter street or strip mechanical pumps on my sm and BBblk 6 pak motors, for the last 25+ yrs, with never a failure, nice pumps,....if your running the stock rubber needle seats stay with the street pump, as the strip pump (8+ psi) will pressurize the needles when they close, and force them into the seats, preventing them from opening, resulting in no fuel DAMHIK ....if you want to run the strip pump, Holley has high volume/pressure steel or titanium seat assys,.....myself I generally run the strip pumps, and steel seats