Transmission Recommended to Run Behind Built 360ci Engine in a 63 Valiant

If your tranny is for a slant six it will not mate with a v-8. You'll need to round up a v-8 tranny.

Damm, lol, that will probably be a chore. Not sure where to even look. Wrecking yards around here don't have anymore old Mopar parts. Any suggestions besides ebay & craigslist?