Thanks all for your replies. I have committed to buy a rebuilt "B" engine from a Ford Barner that is setup to drop into a Model "A". Moreover, I put a friend in search of a "B" engine onto another Ford Barner who also has one for sale.
I appreciate the suggestions to buy a Burtz engine, but the installed cost of a Burtz engine substantially exceeds the cash I have available. In my opinion, the Burtz engine is technically the best option.
The idea of cross-decking parts from my broken engine into a Burtz engine to avoid cost sounds good, but may not be doable because of the damage done by the #4 connecting rod. I haven't taken the broken engine apart yet, but I expect to find significant damages to the crankshaft, the camshaft and the cylinder head. I will post the internal damages on the Barn in the future.