I have acquired a complete explorer engine and am wondering how much better the heads are than the stock heads on my 95 gt. They have the 3bars on the front of them which should make them gt40. I really don't want to drop the cash to buy afr's, so what mods(porting etc) would be worthwhile, assuming they are better than my stock heads. also, what mods need to be made to the explorer tb to make it work on the mustang? Any suggestions to improvent on the intake system also would be appreciated.