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Mild budget economy build? run the stock heads. they'll support 400 crank hp as-cast, and the cracks are not detrimental. If you're worried about the set you have, then take them to your machine shop and have them leak and pressure tested, to make sure that A) coolant won't leak into the chamber, and B) compression won't leak into the ports.
but if it were mine, I'd run it.
I agree 100% with this post, I put a set of stock magnum heads that were"cracked" between the valves on my Father's 1990 ramcharger that I swaped a 360 magnum into. Four years later still runs great, no water loss or compression loss.
2000 Dakota R/T, 408 magnum, 727, Indy heads 1000cfm 4150 carb, 93 octane fuel. motor; 10.258 @ 132.78 200 shot; 9.262 @ 144.69 racemagnum
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