So it turns out my '66 that originally came with a 273, actually has a 400 6730 coded 318 from 1976-1984. Looking to make it breathe better with a 4bbl intake and carb. Is it basically the same as the earlier 318 and 273? Differences? Was looking for and Edelbrock LD4B but want to make sure that'll work if I can find one.

So it turns out my '66 that originally came with a 273, actually has a 400 6730 coded 318 from 1976-1984. Looking to make it breathe better with a 4bbl intake and carb. Is it basically the same as the earlier 318 and 273? Differences? Was looking for and Edelbrock LD4B but want to make sure that'll work if I can find one.