fyi i bought a rwd 4age package for 1200...that was everything, ancillaries, clutch, motor, loom etc...basically the rest of the cash went to fuel pump, lines, gaskets & wiring
if you can get a ze engine & loom inc ancillaries for 1200 then go for it...these days a 1/2 cut will set you back about 2200 if not more. You can reuse the t50 behind your 4ac also
the ge imo is a cheaper & easier conversion if your tackling it yourself & its your first conversion
fwiw theres a guy on ae86dc thats offering a drive in drive out 4age conversion for 3600...thats about the best deal you can get if you get someone else to do the swap for you