Re: 1968 C25 307 to 350 Swap Advice
I think the base 350, left completely stock, with a ~600CFM 4-barrel (or a Quadrajet set up right) will run so much better than the 307 you'll be surprised. I don't think it's possible to make a 350 out of a 307 unless you achieved some funky stroker combo. For the same cost the crate 350 is a no-brainer.
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Alex V.
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1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs.
1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.
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