Unit97, its all n how much money you want to spend. If you just want to drag and you don't care how you get there, go solid. I myself preffer the polyurethane bushings, but this isn't a cheap solution, you can pick up a kit for about $55.
Rubber is best. Reduces stresses on the body that tend to break and bend it in day-to-day operation. I am pretty sure by studying photos in old magazines that Big John Mazmanian welded the body to the frame in his candy red Willys coupe!
The rubber rollers used on boat trailers make excellent spacers and have a 5/8" hole already in them. It is best to part them on a lathe with a knife shaped tool, the rubber is very firm but not flabby and makes excellent mounts or suspension bushings.