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Not only will the 700R4 NOt bolt up to the Olds 350...the 350 won't fit in your IROC....There were basically 2 trans bolt patterns in the old days of GM...BPO (Buick, Pontiac & Olds) and Chevy. Now there is one bolt pattern Chevy (corporate). On to the engine. The Olds "rocket 350" is equalivant to a Chevy big block when it comes to external dimensions and the engine mounts are completely different. A BB will fitin a 3rd gen..with lots of work and careful parts selection.
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