Good day Mickey. Are there good instructions on how to do this conversion that you used? Everything that I have found has been lacking. I currently have a GM 2.8L V6 (out of a S-10) and am trying to find a "good" T5 transmission.
Mornin'!
I bought all my conversion bits from Bill Guzman, company is Classic Conversions Engineering. I believe he has assigned some/all sales over to Brian McCullough at BMC Classic Restoration and Conversions in Minnesota. Bill had a very comprehensive set of instructions and was a big help. Brian has had vast experience with the GM V6 conversions. You might want to reach out to him.
Bill Spohn, posts above and he linked Brian's website, has also had a good deal of experience, especially with the 3.4 (same engine I had, though I chose the Holley 4 barrel over the fuel injection).
Finally, yes, the 2.8 will outperform the stock MGB engine. But it's one of those deals where, if you're going to make the switch, you'll be much happier with the 3.4, and there's a fair amount of them still out there, with plenty of parts and tech support available.