63-72 Chevy P/U Rear Shock Mount System

[65Gregg]

Rob is there a reference point to measure from for the frames that don't have the 5/8 hole you had in the frame on the shop truck? I noticed Andy said his didn't have one. I have a hole in mine but I'm not sure it is the correct one. In the case of there not being a hole is there a a specific angle the shocks should be mounted at to have proper action? I have be told that Monroe shocks don't perform well at an angle in excess of 30 degrees, apparently the valveing is affected. You thoughts are appreciated.