68 Dodge Dart engine swap??

The mounts on the K frame are different from /6 to SB.

I have a V8 K frame for sale. $100 + shipping.

Another alternative is a set of adapter motor mounts. Transdapt and shumacher maker them. Transdapt are much less expensive, but the hardware needs replacing.

Neat car to start with, has manual steering on it which will help with exhaust/headers.