I have a 64 C10 longbed fleetside with small window. I bought it as a rustbucket and after some work, it's my daily driver "rat rod" truck. I kept the 292 I6 motor and SM420 4-speed, but added a Carter 4-barrel carb, split headers and glasspacks. It's painted suede black with Moon Disc wheel covers (original 60's items.) I cut 2 coils outta the front springs, which is really too much and it rides kinda rough. But I like it. You can see what I've done with it starting on
this web page and following thru the successive pages. Eventually I'll upgrade the front suspension to disk brakes and power steering, but it's ok the way it is for right now.
Good luck with your project.