That year Nova Subframe won't work for what you want to do. If you go Nova, you want 68-72. I really like the idea of mounting the 33 Body on the complete S-10 frame. Compare the wheel bases and track widths to see how close they are. Then if you do like Matt suggested you can end up with a lot of the modern stuff from the S-10 like IFS, disk brakes, power steering etc. And there are kits, brackets and headers available to put a SBC into an S-10 that should be adaptable to the project. If you buy the car for $3500, and search well for an S-10, you could end up with a running project for less than $10k, maybe a lot less depending on how much work you can do, how well you shop and scrounge and how wild you want to get with the project.

Good luck

Pat