I'll second that, we raced LT-1 crate motors from '70-'74 (Late Model Sportsman roundy round) and they were always the high compression '70 version. Ours came with stick flywheel and no bellhousing. Changed the pan and oil pick-up and that's it.
All that being said, we were sponsored by the local Chevy dealer and could pretty much order any configuration we wanted. When I say we; my dad built the cars and I was a teenage assistant...lol.
Turned them 7-7,100 RPM all day, adjusted valves constantly and rarely had engine failures. One race in Canada (bigger track), the tach pegged at 7,400! Motors would last a full season before rebuild. Absolutely bulletproof.
I agree, put in a Vega!!
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