LA block running magnum heads

It will be going in my 72 duster planning on making it into a street strip car/ old school drag car kinda (like people would build in the 80s or so) Really want a small block stroker but decided this would be a better option both for my wallet and don't want to make it so powerful im afraid of it. I have heard about the crack you are talking about with the heads which is the main thing that concerns me is there any way to tell if it is or not? And i read somewhere you can take the heads to a machine shop and have them re drilled for LA intakes not 100% sure on it but thats just what i have read... Are the LA heads your talking about a stock LA head or an aftermarket head? I have looked at aftermarket heads but cant really squeeze that kind of cash out for them like 600 and up for a single bare head some places... But an input is greatly appreciated!