As much as I would love to see you with an LS swap and back in my shop for some work
I would say hold off on the HP increase. Improve on your driving skills and zero in that suspension for more adjustability. Your car will tell you when you are ready for more HP and reliability. In other words, it may not be a neccesity at this time.
A far as the Viper T56, you can easily adapt it and use your clutch too.
Also what have you done as far as re gearing that diff?