Graham, I know it's too late but did you consider the EZ30 H6 Subaru motor? It's the boxer 6 and is good for around 300HP naturally aspirated. I used to have a 911SC and the repair bills are ridiculous. I think you'll experience a touch of this with your G50, I'm afraid. I had also looked at the G50 but decided to go all Subie for the power train. Keep us posted!
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Introducing the Basilari 306R - '59 low light, 300HP+, Mendeola chassis
http://basilari.com/
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