AHHHHHHHHHH!!!!!!!!!!!!!!! Sounds to me like your in the same boat i was arond november last year, I got sick of blowing diffs and axels, i thought i have to re-engineer the car arond the engine which is what i did, and i'm still doing!

Go the T-50 for sure! A-series boxs don't like too much boost, as you have found out! i would recomend a good quality clutch for it as well.

I found that you only really need to decompress the engine if you want to run big boost, i ran 8-10 psi for ages with no detonation problems, but that was through a carby. I recommend getting a good tune to get the EFI running perfectly, Espeically if its a daily driver.

How well did it go befor the clutch and diff gave way?