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27 T, scratch built road race chassis, 392 hemi, Holley EFI
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The 289's were one of the first "thin wall casting" engines and were pretty much "before they got it right". Unless you are doing a numbers-matching or historically correct build, you would be ahead of the game starting with a later 302.
 

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The T500hp Trans Am 302 engine were Cleveland engines, different animal. I ran a stock dyno tuned 306hp GT 350 engine in both my '34 Ford and '65 Ranchero and from the 1/4 mi et/mph they were over rated. Probably closer to maybe 275.
"cleveland" engine blocks or "cleveland" heads were Not used in Trans-Am or Can-Am racing,
here's a old link to help guys that don't know about Fords 1966 9.2" deck 351w XE race eng ...

351 Modified vs. 351 windsor vs. 351 cleavland ? | Page 4 | Hot Rod Forum (hotrodders.com)

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