Re: tranny swap
When I put Stromberg 97's on my old '60 with 3.90 gears and a 3 speed, I was about 2900 RPM at 60. I never drove over 60 and I was still able to pull 11 MPG. That really is about what you'll get out of a big block Chevy as well.
One thing I am going to try and do on my next build is run a TBI set-up and some kind of overdrive tranny. I am hopeful that I could get about 15 MPG with that set-up and that would be just fine for as often as I drive my Suburban.
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1960 GMC Suburban -305A (Soon to be 351E) & SM-420
(2nd Owner)
1978 Chevy Silverado - 350 DIESEL & T400 w/ overdrive (2nd Owner)
Suburban build thread on 67-72chevytrucks site:
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