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Can you post a pic of where the JB weld was?? I would work on what you have rather than re invent the wheel.
If the crack is on the block then perhaps most of the internal components are still good. Find a engine from a another donor and go from there.
Hello Supracalifragilistic, I was keeping an eye on an auction on ebay last week for a replacement 454 Pleasurecraft motor and it did not meet the seller's reserve bid. This was for a 454 engine with trans out of a '89 Correct Craft, but would be a drop in replacement for your Supra. It is the same combination in my Saltare. You may want to give him a call to see what he wants for the combination plus shipping. I would bet that he still has it, although I have not spoken with him myself.
Here is the link: http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT
Copy the link into your browser to pull up the ad for the contact information.
Your local machine shop will probably have a rerplacement long block for you with exchange of your core. You may also of course have the shop mic all your components to see what can or cannot be reused in a rebuild. This could save you some money if your block, crank, rods, pistons, heads, etc. could be used in the rebuild. You may have lucked out with a blown head gasket. You may want to have the shop magnuflux the block and heads for cracks before making your final decision. Good luck and let us know what you end up doing!