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1970 c-bodies could be had 350-375-390 hp
1970 e-bodies could be had 375-390 hp

motor mounts are the same

RH exhaust manifold is the same on 375-390 hp engines (others are different)

"187" c-body oil pan will fit in an e-body, "HEMI" pan from a 440 e-body will not fit in a c-body

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The differences will depend on which engines you are comparing....biggest difference is between the 350hp C body engine and the e-body offerings....as Dan has outlined. Plus, as mentioned, the 375/390hp motors are HP motors and will have the heavy rod and balancer with the eliptical weight.

Dave