And the turned upside down and redrilled box (with turned upside down heater core) works just fine. I did this for years on a couple of cars before I bought the correct pieces. Don't forget to put a grommet in the holes or you'll end up slicing the hose(s).
And, as mentioned, you'll need a BB cross member regardless of trans as the BBC sits over to the right by 1-1/2" for steering box clearance.
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