Suggestions welcomed

I'm still in the game planning stages (mostly because I'm broke lol) of beefing up my 71 Swinger and I've finally decided on an earlier Magnum block 360 that should make between 450-500hp when it's done. I'm trying to build everything right just one time and end up with a bullet proof street car that I can drive the hell out of every chance I get and not break, maybe it's wishful thinking lol! I currently have a 904 transmission and will be beefing that up as well. My question I guess is more about the differential and the rest of the chassis. I'm inclined to do complete overkill on everything even if it takes longer to get the money to do so, just to build the car as strong as possible. Dana 60? I'd love to get some suggestions.... thanks in advance!