DING DING DING SOUND THE ALARM!...

Depends on who you talk to, but I do know if you add any kind of longer stroke to a 318 it makes very good use of a 2.02 intake valve. I think it was Larry Shepherd’s book on the small block Mopar that mentions the physical interference limitations of large valves and 273 sized bores, so it may be viable for a 273.