There sure is a lot of good information on this. So if I run aluminum heads and intake manifold would I benefit from a 1" carb spacer, heat shield, lifter valley baffle and a 180* thermostat? Looks like a factory cold air set up would be a good idea for me. I don't want the manifold to be to cool. I'm not going to be driving the car in the winter time so I won't be needing a heater. In fact the heater hoses will be removed. Is there a water pump available with out the heater hose outlet? Should I even run aluminum heads on the street? For my application would I be better off with a set of 5.2 magnum heads if I can find a set that's not cracked. I'm wanting a closed chamber head so I can run the pistons at zero deck, this helping compression, flame travel, detonation.