I run the Holley Dominator...an8 supply and return.. with the injectors in the lower part of the runners you can move more air for more power... if your injectors are large enough you wont have an issue... I do prefer a return system.. ALL THE TIME...keeps cooler fuel up front EDIT Mine is on a 416ci.. just had it out today and it ran STRONG.. and I didnt even open the elec dumps