alright scott. i have been talking on the engine and driveline forum and i have narrowed alot of things down so here goes. So the other guys tell me i can use a 1966 k20 and it swap the engine or uprgade it, swpa the axles for more more modern ones and, put a newer tranny with a good overdrive in it for better mileage. so if i can do just those few things, obviously mechanic work is never that simple, i would be extremely happy. sorry bout the confusing c20 k20 stuff. i didnt know the model designator. i have worked on my c20 camper special alot but i havent been able to get into building my own trucks well because i havent had the money or time. i am only twenty five. so now is a good time to start. i have a shop with tools and lifts at the farm so i can do most work. i have never done axles but i am sure with the knowledge on here and my dad and uncles i can get that done fairly easily. i had a thought to put a cam and a small supercharger on a 283 small block V8. that is my favorite motor of all time. i wanted to modify it to get the power of the larger motors in the smaller package. but i am willing to reconsider if that just isnt a viable option. no matter what i will stick with and 8 cylinder. ok so axles, tranny, engine, and wheels and tires. can i run 18" off road wheels with 35" tires on a stock 66 k20? thank you for your advice this has been so wonderful. there is noone here in iraq for me to ask and i only have a couple months to build this truck when i get home in august or i have to buy one to go back to work. i can take my c20 for a while but i dont like putting the extra miles on my baby! lol. thanks again.