Not Ranked
You could get a 428 crankshaft or equivelant and that will get you to 406 I believe.
Best bet is to contact one of the engine builders on the site here for suggestions based on what you want to do with it.
There is Keith Craft, Gessford, FE Specialties etc.
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Remember, It's never too early to start beefing up your obituary.
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