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Re: 307 engine
Use the 305 cylinder heads on the 307 they have 1.84 intake valves 58cc combustion Chambers and hardened valve seats.
The increase in compression from the smaller combustion Chambers will be offset by the fact that you're still using the stock flat top pistons so you won't get a lot of detonation if any.
Use a 1ton quadrajet on a Edelbrock spreadbore performer Dual plane intake and use a vacuum advance hei distributor.
There are several good cams that should work well with that combo. It'll be a much better behaved truck engine than the 305.
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8
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