[Volfandt]

I must have misunderstood your question. The front mount bolts to the crossmember and the side mount bolts to the frame?

In any case good question on a kit. Theres many choices from a SBC to LS to CBB motor mount kit but don't recall seeing any for a side mount Stovebolt engine. Not to say there isn't I just haven't looked.
Might try looking at Summit and the other popular on-line resellers.

In viewing your craftmanship in other threads I dare say you'd be able to make one up as good or better than a kit anyways.

Good luck
Dave