I saw that Engine Masters episode and was pretty impressed with the carb air gap. I think the Hughes intake is pretty much that with injector bungs, so the results are probably pretty accurate for EFI comparison purposes.
I do have an OBD II PCM and engine harness from a 1999 Dakota 5.2 manual transmission that I plan on swapping in once I get some other things straightened out.
That was my plan... drive it and enjoy it for a while on OBD1, then upgrade to OBD2 and get a tune. But I wasn't sure how an OBD2 PCM could control the 46rh OD and LU, so I was thinking I would probably have to do a trans swap too. Then I found a MP OBD1 PCM part # P5249546, so I think I'm done with engine upgrades.
Let us know how that MAP sensor replacement works out for you!