29 years after a rebuild....

B'cuda said

I meant something like the Huges LA heads, I'm just not sure what castings they use and they probably have a core exchange. I don't think I'll ever need a set of aluminum unless the price was comparable.

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That's what I thought.... beware that all anyone has right now (as far as I know) are 'LA intake' heads, meaning that they are the Magnum rocker system heads but with the intake mounting drilled for an LA intake. The LA-X type head with the LA shaft rocker system has gone out of production; but I have not checked with anyone for several months to see if a new foundry for the LA-X type castings has been found and brought on-line. (IMM Engines or Hughes might have some new info on that matter.)

And, those are closed chamber heads with about 10 cc smaller chambers. You'd need tall head gaskets to work with the stock type pistons that stick up out of the 340 block, unless you have the later lower compression pistons. And even then, the compression ratio would jump up a point. That would be OK for the lower compression 340 stock-type pistons. It would take some examination to be sure it was OK with the higher compression stock-type pistons.

Do you know which pistons you have? 2 eyebrow or 4?