@toolmanmike are the engine motor mount brackets the same on 273s and 318s ?
Thanks LonThere are some threads on this site that give directions on how to modify the mount brackets to work early to late, by cutting off one loop on them and welding it back on to interchange them.
Lon
Mount brackets are different between 273 and 318.
Early 273 had 3 mount bolt loops on each side as does the 318 but one bolt loop is in a different position on each side of the block.
The 67 only blocks for 273 had all 4 bolt loop positions on both sides so they could be retroactive to both mount sets.
Lon