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I recommend a forged Oettinger or a Scat crank with counterweights for such conversions. You can use remachined Type 4 cylinders or Limbach cylinders (97mm bore, aircooled, German air-technique), even conversions with 101,6mm were seen here. Heads can be get from Limbach (hardenend Type 1 style) with the correct bolt-pattern or you can get fresh casted Street or Competition Eliminators from CB, to get max power out of the engine.
You have to machine away the cooling stuff and even a Type 1 cooling is working with high modifications. At least a good Porsche-style cooling will help!
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