I'm almost convinced the 704 would be a better choice after studying all the post.
The 704s lift gets a tad over.500 , will that create additional head work?
I had a 3 angle done when I changed the 400 heads.
Took for granted the shop knew what to do?
Ive already port matched the heads. Is their any other minor work i can do myself?
And thanks to all for the help, for a guy with a non Pontiac car, you all have treated me like family!
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 1970 amc rebel 4-door, faded blue paint,290 emblems on car, 455 under the hood.Turbo 400,3.15 gear.
Best so far 1/8 et,8.90 on street tires,
Since that I have added 400 heads.
I call it a rat sleeper.
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