Slant 6 to 318 swap, 72 Duster, Using 75 D100

If i could find one that would have been the first thing i would have done. I cant seem to find anything on cl in or around my area at all. Sucks because my dad is LAWFISH on here and i grew up in nevada with tons of these motors just lying around but he recently moved to idaho and sold off almost everything. Anyone know of a 318-440 in my area decently priced. Im in between sac and san fran