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Porting stock heads is a waste of time if you do it yourself and a waste of money if you get someone else to do it.

You can find GT40 heads for 200-250 bux if you look around. There are several sets of aluminum heads that I have seen go for 4-500 bux here lately.

I had 700 bux worth of porting/polishing/milling/blending/valve springs/valve job in my stock heads.

I went with my Canfields that I bought used for 600 bux and ran about 8 tenths faster with 6 more mph.