I personally would NEVER sell my tvs for a posi heaton.
I thought the TVS was going to be the beast of the east, maybe I just got my hopes too high? Maybe it's the tune, hell.... maybe I am just not driving it hard enough. I love tq and I love how the eaton was always ready to boost, the TVS just doesn't feel the same.
You're one of the few thats been disappointed. Not sure what to think....maybe a retune is worth a shot before pulling it off? Try 04sleeper for the tune, as long as you don't mind sending logs and going remote (its easy, trust me, he's awesome to work with and a wealth of knowledge on these cars!).
But nothing wrong with a posi eaton considering your fuel restrictions. I'm sure it will still be plenty of TQ fun and who cares if it can't spin 20+psi when you have no easy or inexpensive access to other fuels.....I say go for it!
I have been thinking about Kevin but need to find a dyno rental and put it all together. I just don't want to waste money or move too fast and be disappointed. I am probably going to run the TVS for this season and see how I feel about it but I am realllllly leaning hard towards a retune with a 2.8.