I have an aftermarket TPI system on my 383. When I ordered the system they asked for all the engine and car specs. H.P., compression, bore, stroke etc. etc. The system came with 24lb. injectors and seems to run great, good fuel mileage and all. (23 MPG). It will easily smoke the tires. My question is--I have seem charts for calculating injector size and they all say I should have 30 lb. injectors for that motor! What differences should I expect from changing? I suppose I would see a power increase(not that I need it) but what about mileage? More or less? :confused2: Art