The frame is not similar to the normal 55-57 Chevy Frames...… The box is now permanetly.in place...… The upper two mount holes lined up and I was going to drill a 3/4" hole thru the frame and weld in a piece of round rod with a bolt hole in it for the third bolt......After I started drilling the hole with a smaller size drill I noticed there was a frame gusset in the frame....... Ended up I just drilled the hole thru to suit the mounting bolt and everything cleared perfectly right next to the gusset so there was no need to weld the tubing in for support...... Too simple...… Just had to shim the box out about an 1/8" to clear interference between the box and the frame...…..
