Lots of forced induction engines suffer from detonation. My advice to you is to incorporate some type of alky injection. Lots of us turbo regal guys use either a homemade alky kit or a progressive alky kit. Lots of us running 21 plus psi of boost on pump fuel. Go to turbobuick.com and we have an alky injection forum on our board.

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87 GN, and new toy: 1955 Chevy 3200 pickup, soon to have: 383, Cola crank, Childs/Albert 6 inch rods, Brownfield heads, 10:1 KB hypers, CompCam 284 Extreme Energy, Tilton Plate transmission realignment and built Turbo400.