Jerry, could you elaborate more on the plate? I have plenty of material I'm just having a hard time visualizing how that would look.
It's simply a piece of flat steel plate, about 1/4" thick, that's wide enough to be bolted to the original front motor mount holes and extend back far enough for the Chevy motor mount to rest on. Then bolt the Chevy mount to the extension plate. Maybe you could put a couple of flat bar angle braces down to the lip of the crossmember to keep the plate from sagging under the weight of the engine. "Shade Tree Mechanics 101!"
Jerry