How about the 454 and the 4L60E. You'll have overdrive on the highway and still have the grunt of a big block. Unless it's going to be a daily driver is fuel cost that big of a concern? There are lot of nice Chevelles out there with small blocks but just seems a 70 SS really needs a big block. Of course I have a 70 SS with a big block so maybe I'm a little biased.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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