1965 MOPAR, 273 Exhaust Maifolds

I have a member asking about purchasing a set of 273 exhaust manifolds from a 65 Plymouth Signet. This member would be using them on a 318 engine. So, my question is what 318 years can use 273 early a exhaust manifolds? Thanks. Sgrip65
All if them. 302 heads need the AIR ports plugged.