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I have read where using cylinder heads from a 305 HO engine such as was in Monte Carlo SS motors will improve the breathing of your 283.[/QB]
I have heard this same thing. That is why I am holding on to the H.O. 305 out of the 1983 Z28 that I had. I hear that the 1983-1984 HO305 heads are the best.

Never hold your farts in. They travel up your spine and into your brain...that is where crappy ideas come from.