and if i recall two different style headers will produce power at different rpm's... if your motor is a tourqe monster use under chassis but if you have a lot of horsepower use the higher rpm headers, same deal with dual plane & single plane intake manifolds
i have them in an A body & i dont need a football field... i dont wont to sound like a broken record but its possible to have a full turning radious with fenderwell headers
if you want to be able to have a full turning radious with fenderwell headers you need low profile tires, it really doesnt matter how wide the tires are.