There must be a couple of mad scientists here who can help me out.

A recently came across a near mint condition '80 Escort mk3 with a flimsy 1,1 Valencia engine and as i have a way of doing i bought the car well knowing that the engine had sung its last song. The guy who i bought it from had run it on unleaded fuel for waaaay to long an so the valveguides where shot to hell.
The idea was to use it as a daily driver but i'm thinking of doing an engine swap instead of fixing the old one....my problem is that i got a bit confused as to what engine and gearbox combination i could pop in it without any rewirering or moving of engine mounts.
Any ideas?