we did a mild system for drivabilty. we put a edelbrock 3701 with an adapter plate because the aluminum aftermarket heads would not allow the tbi manifold to work. we think the heads with the big valves and 200 cc intake runners require more air/fuel than what the tbi can do. The tbi has the mods and flow check and balanced injectors from the stock 350. It sounds wicked at idle and WO and if I keep the rpms up to at least 1.5 it does not load up but fuel goes as fast as the truck. Using no ethanol 94 octane gas. thanks for any thought on this