After consulting with the car oracles I need to do some major work to get the 2.8 stock V6 healthy. So I have come up with some options to replace it. I’m keeping the stock 4 speed regardless of the outcome here.

LS4 (Pro : POWER! Con: lots of fab work / expensive )

12a rotary engine (Pro :Rotary! Size & weight, Con: lots of fab work, apex seals

Supercharged 3800 (Pro : plentiful, easiest to swap. Con : weight & power are not great)

Or just fix it (Pro: it’s still stock. Con : power isn’t good, what breaks next? )