i have a 72 f100 with the 360 engane i put a new transmition and carb and fuel pump on the truck but cant git the damn thing to go past 60 mph anymore i cant even git it to burn a tire whene i take of with full throtle im thinking that its the cheep aftermarket carb hope some one can help before i put the new parts on it ran like a 360 shoud run

 

is it backfiring or anythign when tryign to speed up?