Porting the stock heads can only help, and if they're in need of a rebuild anyway, why wouldn't you? I know some people will say to put the rebuild money towards a new set of heads, but when every dollar counts sometimes it makes better fiscal sense to make what you already have a little better.
Just my humble opinion.
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542