Two questions for you regarding the idle quality:
1. Did you remove the spout before setting your initial timing?
2. Is your MAF Meter calibrated for your injector size? A Pro-M should have the injector calibrated size etched onto the nameplate.
If yes to both above, I'd advance my initial timing to 14-16 degrees first off and see how it runs, it might want more. I'm running 14 initial on my stock '93 GT, on 89 octane and an AOD with stock converter. You've got way more aggressive cam timing, so the motor's going to want a lot of initial timing. I would back down the fuel pressure (unplug the vacuum line) until the motor cleans up at idle. These things don't cost you anything, and you can put them back to whatever you had if your not happy with the results. Do the timing first, then play with the fuel pressure. Plenty of people have run similar combinations with the stock computer, so I think your troubles are fixable without buying a stand alone tuner.