1973 duster radiator

I don't know the difference between a slant 6 and a 340 radiator.
Not sure if it works or not.. That's cool whenever you find the time thanks
I'm thinking the 340 radiators have more rows (Thicker cores for better cooling), but the dimensions are the same. Even the one I have from the R.R. looks like it has the same overall dimensions, as it is a 22" radiator.