Attached photo shows the motor mounts in my 65 C10. I'm putting a 292 in it, so the passenger side has to be re-positioned forward. It appears that there is already a hole in the frame for the forward bolt, but what about the bottom of the mount where there is not a hole? Seems like if there is one in the frame there would be another one below unless I am completely wrong, which I may very well be.
Sorry for my photo. I didn't go far enough over to show the hole in the frame.