70 Duster T5 Swap
You can forget it holding up to a turbo. The World Class units are only good for like 330 LB FT. Unless you are real light and or have traction loss.
I have one behind a pretty mild 5.0 roller motor I am getting ready to put in a Mercury Bobcat and I plan on being easy with it.
I think you will need to upgrade it pretty quick. Good luck, though it looks like a good swap. I hope it holds up better than I think.