I think you need a crank adapter.
Summit, Jegs all sell the crank adapters for various v8 engines.
You need to find out if one of those could work on the 4G64 crank.
http://www.summitracing.com/parts/CCA-4793/
http://www.summitracing.com/parts/CCA-4798/
http://www.summitracing.com/parts/CCA-4797/
http://www.summitracing.com/parts/CCA-4799/
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