Mounts for a magnum?

Putting a 5.9/360 Mag in a 65 Valiant

Reading through all of the posts I could find it seems like the Trans-Dapt 4695 mounts only work for 67-72 years, and the factory 273 mounts will work, with a modification for the extra hole and some shims/washers.

Before everyone starts yelling at me for now using the Schumacher mounts, it's simple, I'm trying to keep costs down.

Can't seem to find the 273 mounts, rather when i get a hit, it's just the pads. What am I missing?

Sorry if this belongs in the mag/swap area, but it's early A specific so I figured it was Ok to put here