I've always thought 6X-4 heads with 4" crank in a 400 block would be an easy deal for a street engine. The chambers will allow a decent compression ratio. Just a great combo, my opinion...
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1977 Black Trans Am 180 HP Auto, essentially base model T/A.
I'm the original owner, purchased May 7, 1977.
Shut it off
Shut it off
Buddy, I just shut your Prius down... 
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