Re: manifold confusion
Does your buddys motor have thick plates between manifold and heads? If not, it is a propper 351M/400 manifold.
If it does have the thick spacers, it will have a 9.2" deck std cleveland manifold adapted to fit the taller M block.
More than likely it will have the M manifold which can be bought in 4 barrel.
And to clear it up, the M heads are the same as any other Openchamber 2V cleveland head. And the 351M/400 are fine in this section as i class them the same as any other Cleveland motor.
10.70 @ 125.00 on the black fun top
408 Cube Cleveland.