Re: 1966 c20
[QUOTE=GMCDAC;56668]That 3/4 ton truck probably does have 4:11's but still should run higher speeds. My '72 3/4 ton GMC also has that ratio. It's a 350 but will run all day at 75 mph fine. Sucks a little more gas than at 55 -65 for sure though.
If you go to a 350 find a set of 327 valve covers and they will look identical! If I remember right the 327 was a 4" bore just like the 350 anyway.
Issue with going to earlier 327 valve covers is they don't have the oil cap in the valve cover so you need the corresponding intake manifold with the oil neck and PCV fitting, that is if you want to be period correct.
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