So I am new to the site, but have been reading here for a long time. I am a novice when it comes to tuning, but want to try and do it myself.

Truck 88 GMC Jimmy (fullsize)
Motor: 383 stroker (10:1)
Cam: SUM-1105 flat tappet cam. (summitracing)
Aluminum 190cc heads (64cc chamber)
Stock 454 Throttle body (80lb injectors)

My ecm right now is a 7747 and has a stock 350 tune.

I don't want to ruin my new cam by having a tune that won't start up and run good enough to break the cam in right away. I don't need it to run perfect, just good enough at first, and then I can fine tune if from there. I am assuming my current stock 350 tune isn't up to the task, but I wonder if I could do a stock 7.4L tbi tune to break the cam in? I know one guy who successfully did this, but it was with a 350 with a cam. I would assume it would work better with the added displacement of the 383.

I am thinking the easiest thing to do is snag someone's bin for a moderately built 383 who used big block injectors and go from there.
Any help is appreciated.