I put the earlier version 350/300HP crate engine in an 86 GP with headers and dual exhaust. It was a dog, but that was with the stock 2.78 gears. 3.73's would have helped, but it still wouldn't have been fast.
I don't know about now, but back then the quality control was poor. The cheap chrome timing cover it came with had the crank oil seal hole off-centre, and 3 months outside the 1 year warranty, it started burning oil big time. I stripped it down and didn't find anything wrong, so I figured maybe bad rings?
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