Dead Ahead Ed
You will need a single cab long bed S10 for the simplest swap. An S10 4x4 rear axle will get the rear tires away from the bed. 2 inch back spaced rims in the front will get the tires outboard. The weight of the 50 Chevy truck and the S10 are both 3100 lbs. The long box or long bed single cabs are getting scarce. It was easier for me to buy a used S10 than get the rolling frame from a salvage yard and cheaper, too. I'll sell or scrap the S10 body to reduce the costs of this project. Good luck.