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Sounds like the proverbial "Pandora's Box".

Personally, I'd either overbore to a set of KB167 (or KB399's) OR do a 4" stroker. Keep the "J" heads and all the other cost to go Magnum doesn't rear its ugly head.

I lived in the Broomfield/Arvada/Louisville/Westminster/Lafayette area of CO back in the early 80's. Passed through Lyons several times. Keep the 3.23's and build an efficient pump gas torque motor (meaning highest compression for altitude) that will pull to 5500. Done.