Is it a 1500? A 6.1 long block bolts in also and they are getting more affordable. No reflash or anything needed unless you put a NON MDS engine into one that came with MDS, in that case a flash can remove the check engine light code.
The truck IS a 1500 with the MDS. Knowing that a 6.1 can be fitted is encouraging. I would likely reuse all the front accessories, the truck oil pan and pickup, exhaust manifolds, everything that is truck specific.
