I'd be ten times more likely to cram-in a 4L80E or similar (4L85E) than to buy and build-up a 200-4R.
The '80E is inherently much stronger than the 200, but would need an electronic controller, and an adapter plate to mate with a BOP-C engine. OTOH, it needs approximately nothing beyond a "shift kit" for internal modifications to handle typical stock/mild/moderate 455 power.
The shifter issue is fixed with a piece of specially-cut steel, and a new "lens" with OD, D, 2, 1 markings. Both available commercially-made in the aftermarket.
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