2004 gmc sierra duramax stuff into my 71 GMC 3/4 ton

[gmc1971harwich]

hey guys. this past week my dad was coming back up from Sarasota, Florida headed back to massachusetts and some idiot ran through a stop sign and slammed into his drivers side front corner and wrecked his truck. my dads of but the truck is probably totaled. the collision shop said it would need a whole new frame but didnt touch the drivetrain. my question is if the insurance company ends up totaling his truck, do u think it would be worth it to buy the truck back for parts, have it towed back to massachusetts, and swap the motor, drivetrain, seats, steering column, wheels and tires, over to the 71 GMC? and sell the rest of the stuff that wont work with the 71?
his truck is a 2004 GMC Sierra 2500HD Duramax diesel. its a 4x4 crew cab pickup with an 8' bed, same bolt pattern as my 71 8 lug. its got stainless steel tube bars, power programmer, and extang tonneau cover? Has anyone ever done this kind of thing before? money would be tight, and id only consider it if it was worth it and alot of stuff was bolt on thanks
my truck is a 71 GMC 2500 2wd 3/4 ton the 327 in it is ok but the 700r4 needs to be adjusted at a shop and leaks.

have any of you bought a vehicle back from the insurance company that was totalled? how does it work?