Just wanted to update this thread. After talking to several people, taking into account opinions here I went to work trying to get the car to a place where it'll be okay for this upcoming season.
I'll continue to mix fuels through the summer to help the detonation out. I ended up pulling total timing back to about 31 degrees, then adjusted the vacuum advance lockout to give me a couple more degrees during cruise. This has given me the bandaid of having the timing the engine wants to keep it cool while cruising around and not hammering the rotating assembly at wide open throttle. I also modified the tune in the EFI to deliver a richer mixture of around 11.6:1 at wide open throttle.
Over the winter I'll be going to a set of aluminum heads and a hydraulic roller cam. I'm leery of continuing to run a flat tappet cam because of the amount of ZDDP required which can fowl oxygen sensors.
I just wanted to say thanks for everyone that replied to help out on this.
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-Jason
1969 Pontiac Firebird
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