Bare minimum- v8 frame stands/motor mounts, a 302 with the front sump oil pan. Your trans/radiator will work with a 302. Other stuff that's nice to have- v8 belly bar, v8 double hump crossmember, v8 throttle cable.
I have all the parts you need to swap to a V8. Frame mounts, belly bar, double hump trans mount, throdle cable with bracket and engine wiring harness. PM me if interested. Thanks, Rick