Custom built.
You'll need:
1. Good block.
2. Aftermarket "H" beam rods
3. Forged Crank
4. Forged Pistons, try and get them that are made for supercharger/turbo, cause the top ring is lower and compression should be lower too.
5. Main bearing support
6. Screw in freeze plugs
7. Lots of head work.
8. "O" ringed cylinders
That should get you started.
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