Older 454 Block with NEWER Fuel Injected Heads?

[savatreatabvr]

I have a 1973 Chevy c20 454 that needs rebuilt, I've got a chance to buy a pair of newer (not sure what year?) heads off an fuel injected 454 for a good price. Can I use these heads on my older 454 block and will my older intake manifold bolts on to the newer heads? If for some miracle this does work will I run into any tuning issues? I don't have my 454 torn down yet so I don't have anything to compare the new heads to.