what motor should i use

[61apachec10]

I have a 2000 454 vortec that I was planning on putting in my truck with a 24x timing system out of an LS from EFI connection. motor will end up being a 496 with EFI. Just recently I bought a 2000 1500 with a 5.3 LS and 4L60e with 200k on it. I now plan on using the rolling chassis for my 61 c10. I am torn on what motor to put in it. Any help would be great. Truck is not a DD. Mostly to shows, but would like to drive 100 miles or so to a car show. I also plan on putting a 80e in place of the 60e.