cummins swaps into chevys are not hard at all, they are expensive if not planned properly. And it all depends on your area and parts available. The biggest problem i have seen ppl have with cummings swaps is simply moving the heavy beast. Cant put it on a regular engine stand, and some of the 2 ton engine lift thou they will pick up 2 tons they cant with much reach. If money isnt a issue there are kits that supply just about everything for a pretty painless swap. there atleast 4 companys selling engine mounts, theres tons of trans adapters out there and painless performance makes a complete wiring harness that jst has 4 wires to be connected. The thing I alway look at in finding donor vehicles is does it have the parts I need and how many parts will I have to out source. For instance, my last swap was a 93 6bt into a 2500 suburban 4x4, well I found a wrecked 93 w250 4x4 with the auto i wanted, I was able to use the motor trans transfer case, the axles intercooler even the driveshafts were used (after i resized the rear the front was the right length). And the suburban was a diesel so I was able to re use the fuel tank. The total swap including completely rebuilding the motor trans transfer case and axles took me 2 months, mainly due to rebuild times. if I didnt choose to rebuild everything I would have had a bottom line cost of 1200 for the parts truck and 2156.89 for remaining parts to complete the swap. But I added a significant total to the listy because I decided to totally rebuild the drivetrain and upgrade alot, since i was also swapping a P7100 injection pump I also had to upgrade my turbo(well twins) injectors, fire rings, camshaft, the list goes on. But I still completed my entire swap including paint and body work for 11789.28. I know alot of people probably reading are thinking im nuts but I have 12k in a truck thats not out there its completely new I know every nut and bolt, and its purpose is to haul my family (6 kids) and my travel trailer. So I am happy, the truck pulls better than the excursion it replaced, gets way better fuel economy, and most of all the swap was a lot of fun. I would be willing to help anyone looking for a cummins swap, or any other ?'s related to them.