Magnum heads on a LA

I have a 90 360 roller short block ready to go. I've been looking for a top end and finally bought a new set of bare 360 Magnum heads. The machine shop thinks we could set them up for chevy rockers (cheaper and a lot more choice) Who has done this and how did it work out?? I know I'll need custom hollow pushrods and the studs on the chevys are bigger so we'll have to bore and tap the rocker stands. What else will I need to do and is it worth looking for the self centering rockers. What do I need to do to make this bullet proof???