The -8 heads are not the end of the world. My TA had 7.6:1 compression ratio, 2.41 gear, and with the stock automatic, ran nicely. Cliff uses a couple of Crower grinds that help these engines.
If you were to find some 6X-4's at a machine shop, ask them if they'd take the 7J2's as cores. Doesn't hurt to ask...
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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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