1966 Dodge dart clutch fork 4 speed v-8

That's a 64-66 A and B body bellhousing with a 273 and a 9 1/2" clutch. Brewers will help with that one. They didn't want to sell you one if you didn't know what you had for sure.
I definitely have a 10" clutch in it now. The clutch kit is: Rhino pak 05-004