[Bazooka]

I am thinking about buying a 67 firebird that has a rebuilt 350. The engine has never been fired and I was told it was built by Glenn Gibbons of Apache Junction Az. From what I have been able to dig up hes a pontiac guy and respected engine builder.

The seller told me the 350 is .040 over with #13 Heads. These are Big valves screw in studs and listed by the factory at 72cc. They decided on the Comp Cams XE274 cam.

Using the wallace racing comp. ratio calculator this comes out to 10.4 which is what the seller told me the comp. ratio of the engine was.

The seller told me that the engine was built to run on 91 octane which is what is highest octane pump fuel available here.

I always heard 9.5 compression is about the safe limit for 91 octane.

Is this engine doomed to suffer detonation or can it run fine if tuned properly?

Thanks for your advice