yer buddy that burns through tires, he got the SAME slant 6 set up, you do? HIS might have a 4 barrel on it, and makes a world of difference on a slant 6.....That make his a super-pak 225, OR, what was the other one? Hi-Po 225????
There is a bit of difference with them depending on the carb set up, and what one it has!
It could merely be he has other then the Holley 1920 you have.....
Its funny how it works but you'd swear they weren't the same C.I.D with just 2 different carburetors feeding each engine!!!!!