i have e-heads on my 465 in a 73 charger.tti 2"fit well but anything less than WOT car was slower.it is heavy and not a lot of converter or gear(at the time).i have regular comp 1 7/8 hookers on there now.i had to clearance for the steering box and coupler(different clearance issues on 73-74).for more street than strip 1 7/8 would be fine.