If anyone makes such a kit, it would not be Chevrolet. Actually I would be shocked if ANYONE makes such a kit.

Engine swapping an SBC into any MB is a challenge. You will need the correct oil pan and use a GM transmission that will fit in the trans hump. If you have never done an engine swap before, I don't think you know what you're in for. If you have, then I'm sure you will know how to do adequate research to make it happen.

If you do some looking, there was a gentlemen that swapped a Chev V6, I think the one that is a sawed off SBC, into a 300TD. He posted pictures of the process and did an excellent job. He obviously had much experience as well as the necessary fabrication and welding skills.

I have seen in some Haynes manuals some diagrams for difficulty of a repair operation. They show one to five wrenches, with five wrenches being the most difficult to accomplish operations. An engine overhaul is five wrenches. An engine swap like you are considering would be about ten or fifteen wrenches.

Good luck,