[67chevyk20]

No problem. You must use grade 8 bolts! I used 7/16 fine thread from Fastenal with top lock flange nuts. Cut the rivets and have frame sandblasted and painted. (I used por15) When reassembling drill the holes out to 7/16, but not individually. Say a crossmember has 8 holes in it. Hold it in position and drill 1 hole through the frame and crossmember, put a bolt in and tighten, then drill another and repeat. This assures that the holes line up exactly and you will not have to tweak a part in order to make it fit. I found some rivets missing and others that were loose. Some holes were worn out to the point that the 7/16 drill bit barely had to remove any steel. I believe the holes were originally punched at .406 and used a 3/8 rivet and when installed, it filled the void. I cut most of them with a chisel, because I did not want to mar the steel with a cut-off wheel. Be prepared!!! It is a lot of work!