KS911 - you should talk with Rod Simpson about engine mods. He has been building and racing these hybrids for 30 years and really has it down. He even has custom ground camshafts specifically for Porsche weight and gearing.
The 400 crank is externally ballance, I don't know if it can be used with the V8 kits. You might consider a short stroke engine for racing, but then you are getting away from maximizing torque. The engine would have a more "Porsche" like power band, but with more power simply due to more cubic inches.
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