Sounds good to me;I think you'd be money ahead to go with the tranny that goes with the engine though.
There's a guy up here who's done a couple of Dodge Cummins to Chevy truck swaps already,but he installed 'em in late 70's one tons. He's working on another one now;I'll try to get out there and look at some specifics. (He says the Cummins will even sit on the stock Chevy motor mounts in stock location.) He moves the rear crossmember about 6 inches,and uses the wiring harness from the Dodge,but not sure how much of it he uses. He says it's a project making room for the Dodge radiator,but when he tried using a HD Chevy one,it overheated,so he goes with the Dodge radiator.He runs the 5 speed manual tranny in his conversions.Basically,on the newer Chevies,it's nearly a bolt in. Don't know how different things would be on your truck,there's probably a little less room to make things fit.But,hey-you're a stovebolter-you'll make it run! Good luck!
Speed


1954 GMC 350
1957 GMC 1/2 ton
1962 Chevy C-30
1952 Chevy 6400 dump bed project truck
'98 Harley FLSTC
'66 Pontiac Catalina
'76 Chevy 1 ton Duallie
'84 Bronco II
'78 Dodge W-200
'81 Toyota 4X4 truck