I use the calculator on S.D. Performance site.
My 77 TA came with the lowest HP engine, 7.6:1, 400 Pontiac engine, 6X-8 heads.
The tune spec was either 16 or 18 degrees, advanced.
Just wondering where your 400 stands, concerning timing?
My car ran pretty well, was peppy to drive. Obviously not a world beater like earlier Pontiac 400's were, but was a great driver.
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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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