360 swap from van to 74 Duster

You will need conversion mounts.Schumacker.

Correct, if you can't find a V8 K-frame, you can get /6 to V8 conversion engine mounts from here:
Schumacher Creative Services www.engine-swaps.com

You may want to consider a drum to disk brake upgrade and possibly change to some heavier V8 torsion bars.

Jerry