Fast rebuild?

You are correct. That is a part of the whole equation that I haven't gotten to yet. I'm thinking of buying some standard V8 spool engine mounts and modifying them to work with my Slant six K frame. But I can't do the mental gymnastics until I have an engine that I can use to mock up and fabricate with.
I had planned on taking measurements and replicating my shumakers before installing them and completely forgot to! I have a set of standard set of v8 spool mounts somewhere i wish I would have compared them before installing my engine. I did a 360 swap in a 75 dart using the shumaker conversion spool mounts it works perfectly. Just have to shorten the drivers side mount on the k frame and drill a new hole and your set. Look on ebay you may get lucky and find a set. I sure hope someone will start making them again.