I'm running my 350 on the stock 250 6-cylinder mounts & it sits back about 3"w/o not problems (dizzy is closer but manageable, not a problem on the LS-1)....
Doc
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1970 Sub C-10 - 350/TH-350/3.73 12-bolt
Came home from the hospital in it & mine ever since.
1966 Catalina Ventura 2-door fastback 389/TH400
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