I don’t believe that 4.4 DME/ECU will rum the 4.8 engine. I too looked at this swap back in the day and if I recall correctly I also needed to pull the electronics from the donor vehicle or another 4.8 X.

I’m sure someone with more experience than I will chime in and confirm one way or the other.


EDIT: All that said, a decent used 4.8 should be available on eBay, or findable by some of your local salvage yards.