Honestly, I don't see much trouble fitting/making the engine work in this thing...probably will be able to use off-the-shelf parts for virtually all of this.
To be honest though, for simplicity's sake, I'd have probably stuck w/ a TH350. That said, O/D is very cool. Considering an OD swap for the LRT.
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1979 Dodge Lil' Red Express Truck
1989 Shelby CSX (#500/500)
The most powerful production minivan money can buy.