It won't be nose heavy. I had an OS 120 in mine, plus a 20 oz. fuel tank a 2700 mah 5 cell flight battery and a 3600 mah on board glow battery all shoved as far ahead as I could get them and it flew fine. I also turfed the stock landing gear and installed a heavy fiberglass land gear in the fuse in front of the wing ( the best move I have done in years ) oh and I also had dummy engine cly. heads glued onto the cowl and yes a heavy APC prop. I never did check the CG I just knew it would be "alright", you'll be fine, maybe even a bit tail heavy they like to fly nose heavy.

They are a great Sunday flyer and I loved mine with the 120 in it, the power was "just right" for lazy aerobatics, I wouldn't have wanted any less IMHO. It was a lot of fun until I forgot to charge the batteries, I may get another someday.