Doug's headers not fitting - frustration

I found a thread describing how to modify a 318 bracket to work, you weld a piece to the driver's side mount so it bolts to the top ear on the rearward side. Look at the 3rd and 5th photos on this post
318 to 360 motor mounts (confused)
yeah but you need to know if the height of the pad the biscuit goes on is the right distance from the mounting holes for the block