CONGRATS!!! If you are running the Proto RR Regulator and CHIP as a matched pair, I wouldn't worry about the A/F's. They're already matched to run at a safe A/F ratio. If you want, just get the car on a dyno and hook it up to an exhaust gas analyser to verify your A/F's under load. You'll be fine! Happy boosting!!!
P.S: Soon you'll want to intercool that baby and run 0.7bar 
PPS: Trust me, you DON'T want an EBC/MBC! BTDT! Not a good feeling when you play with the boost and crack a ring land 
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
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