Stay with the manual. Automatics take alot more work to convert, including wiring, ECU, and possibly other sensors.
For example, on my Escort GT, if I were to convert the manual to a automatic, I would not only need wiring to the tranny, but also a new TPS (manual is a 3 wire, automatic is a 4 wire), flywheel, half shafts, radiator...just to name a few.
Stick with the manual tranny.
Tom