Like many here, I've owned both MFI and EFI GM diesels. (I love the extra power I can get with the newer 6.5 with a Kennedy tune.....BUT.... If I were in your shoes, I'd convert now to MFI, get a stand a lone controller for the 4L80E and enjoy the Burb. No worrying about all the electronics, connectors and such.
Long run consistence of the MFI system just can't be beat.
Dave
Dave, N9LOV
Member #242
Dave's Diesels:
Sold June, 07 '82 1/2 ton 4X4;340k miles
'97 2 Dr Tahoe, Intercooled,
Kennedy ECM, 4" Exhaust
'02 GMC