[wellsyd]

Thanks very much for the info, So far i've bought a Holley 650 double pumper and a ford 4-barrel intake. Can the stock heads be machined to accept large valves or will need to get the different heads. I'm not sure how different springs will take out bogging as surely it's a case of getting a larger charge of mixture through the engine more efficiently,(big carb, big valves) however if it works i'm willing to try it. thanks again all info most welcome