318 with 340x heads sluggish

It has the low profile wheels so they only sit 24" high. The rear end might have a technically different ratio 3:42 but I measured by the revolutions of the tire vs the drive shaft to come up with the 3:23.

As for the timing aspect it seemed to be running well and idling great but not 100% sure that it was correct.

Hooker headers as well. Engine seems to be running well.