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The Arntz is running the smaller and lighter 153 tooth flywheel and bellhousing size. It's a billet alloy flywheel, which would be a laugh behind a tough big block, but the starter motor might be a bit unhappy if you tried to get the 153 tooth combo to spin a big cubes/big compression motor.
Of course, I only assume that any replacement engine will have big cubes and big compression. Oh, and about .770" lift on the camshaft should be just about right as well...
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Craig
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