as far as heads...the gt-40's flow pretty well...it is what they used on the cobra, the explorer also had gt40 heads, but received a "p" designation for how the spark plugs go into the head...it makes it extremely hard to change them from what i hear, but they can be had for prety cheap...although the gt-40 heads can be had for a decent price. I can check and see if my ex-boss has any heads. Let me know.
