Swapping stock heads for stock heads you'll see a slight increase in HP due to the bump in compression. You'll also see a need for higher octane fuel, likely higher than you can get at the local station. If you think gas is expensive, start mixing in $8+ race gas and it gets real old fast. I don't think swap is a worthwhile proposition.
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1966 GTO
1969 Lemans Convertible- F.A.S.T. legal family cruiser. 12.59 on G70-14 Polyglas tires. 1.78 60'
1969 Bonneville Safari- cross country family cruiser. .
1979 Trans Am 400, 4-speed, 4 wheel disc.
View from the drivers seat racing down Atco Raceway- http://www.youtube.com/watch?v=GhYDMdOEC7A
Ride along in the other lane- http://www.youtube.com/watch?v=mIzgpLtF_uw
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