Your solution looks very professional and expen$ive. I am assuming you would need to make/ have made, the fasteners. I would think it would be easier to get fully threaded studs with the overall length you need, and use something like an ARP 12pt nut to retain the timing cover to the block. Then, plunge mill the motor plate just deep enough to fit over the small nuts.
That was my initial idea, but I need to precisely locate the timing cover and motor plate. Using a stud would require bolt dowels in the blocks threaded holes. The setup and machining on the block for this seemed more expensive and difficult than turning a precision threaded pin.
