Welcome Alex.
Might be easier and cheaper to go non electronic, although the 4l80 is a stout piece, stand alone computers are available for it. Compushift has a system doesn't need a PC. I think GM might have something programable. And I bet the Bowler guys could help you out as well.
https://www.hgmelectronics.com/display/hgm/COMPUSHIFT
As for the engine, thats a big jump to 800 ftlbs, procharger and keep your street manners. Give a shout to Steve Morris engines, He just flat out knows how to build and tune procharged engines
http://www.stevemorrisengines.com/about-steve
Hope this gives you some ideas and welcome again
Rich