school me on a 5.9 magnum motor.

340sFastback said

Shipping a fortune. Hughes sells new Magnum heads prob sufficient cast iron around ports for 340 manifolds. So you can spend your way out of head aches buy new Magnum heads LA intake bolt pattern likely 340 exhaust bolts on no adapters improved castings that don't crack quench chambers erc etc etc etc....

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Based on the pictures on the website, the only iron Magnum head Hughes lists doesn’t appear to have the needed material to seal 340 manifolds. Plus they have the Magnum intake bolt pattern and would require the extra cost of redrilling them if you wanted to run an LA intake.

The aluminum heads offered look to maybe have enough meat around the port, but it’s just a guess as I am only looking at pictures on the web.