65 Valiant swap 273 to a 360

This is all great info. As usual from FABO.
As stated before in above posts. If your 273 trans is push button unit the early 273 converter will not mate up to the 360 crank correctly without snout modification or a pat blais or other adapter for snout.
Sounds like with snout adapter and balance plate you will be good to go if using early trans, which should be pretty light on your wallet.