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Thanks all. His car is a 79 SC, which has the bigger ports and 8.5:1 C/R pistons, not the 9.3:1 of the 80+ 911SC.
As this is going to be 95% street with the odd track event at the local Porsche club, he wants it to be extremely zippy around the streets and responsive, so we are in fact leaning more towards the 8.5:1 and leaving the boost at 1.0bar.
He's ordering a pair of Garrett GT28RS turbo's with twin 1.0bar TiAL 46mm Wastegates.
Definitely want to make sure the head is twin plugged, and whatever necessary prep-works are required to the top end too (guides, retainers etc).
What are you recommendations for guides/retainers/springs for turbo application? It's not going to be a high-RPM monster, and he's sticking with the SC CAMs.
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