If it's a 5600 it shouldn't be too hard to get a turbo from a 76/7700 and bolt that in place, get an oil supply and drain. IIRC, my 5000 is tapped into the cam gear cover for both the supply and return.
I'd really make an effort to get a twin inlet Garret/AiResearch turbo rather than the older single inlet Schwitzer's that the 7000 used. You really don't want one of the old M&W setups in my opinion. That's what I have on my 5000. It's not a great turbo and I understand (perhaps incorrectly) that it's now made of unobtanium... but it's a poor setup anyway. I want to change mine over to a Garrett.
Like the others have said... don't go too crazy with the fuel or you're just going to melt something down and as noted... it's going to be hard to keep cool period. You might also want to look into the injector sizes. The 5600 may have a small nozzle that's about topped out for delivery anyhow... so you might add the turbo and get absolutely nothing from it. Regardless of what changes you make I wouldn't recommend taking it over 80 hp.