I know there are a bunch of different heads, but is there any guide to which is good for what? I'd like to buy a used/rebuilt head and do some major porting/ polishing and run bigger valves. Then I'd like to either fabricate an intake or run one of those turned/ported ones and a larger throttle body/ MAF. In addition to a cam, hopefully I'll see enough grunt to stop being embarassed by old beat up honda accords with stick on hood scoops. Or will I be so disappointed with the performance that I should start with a Turbo head so I can turbo it after I realize how lame the thing still is? If I swap in larger injectors (already doing a Fuel Pump/regulator), what else do I need to do? Can I just swap them and go or do I need to run a different MAF or a tune or ? Is the head the reason these engines do not make that much power? I noticed the throttle body is pretty small for a 2.3. It does not seem like the intake ports on the head are that small. Has anyone flow tested these engines part by part to see exactly where the bottlenecks are? Oh, thanks.