Just saying I like Carter fuel pumps.... and that the big boys of old all ran just fine off of mechanical fuel pumps feeding a lot of cubic inches and around 400 hp. My brothers '68 GTX with headers and a couple of other upgrades could be floored for a 1/2 mile and no fuel issues..... No, I'm not saying mechanical is better than electric, just saying that they work easily into the 12's
OK, and I do to. It's just that the M6866 is rated at 25 GPH. You might get more our of any of them but none would be guraranteed to support 400 HP. I just can't in good conscience recommend one for the OP.
