Is there a reason you want to run the Gutsram VS the original Wenzler? The Gutsram was made for the Wide Port Bolt Pattern. I did drill my Eheads so they would accept both intakes. With a 340CFM port the Original Wenzler was .07/.08 faster in the 1/4 in back to back testing.
I don't see where it would be an issue to drill and tap the factory head or use a keensert.
I know Jeff Bourcier made a plate that went from the front intake bolt that holds the crossover on and it basically laid across the 2 pieces and clamped down on the intake where the bolt by the port was. Basically is was a piece of aluminum about 1 1/2" with a hole drilled in it.
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66 GTO Nostalgia Super Stock/Street Legal Car
421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99
Multiple NSCA/NMCA World Champion
66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles
67 GTO 2dr Post, 428, Tri Power, 3.55 Gears
80 Trans Am Black SE Y84 W72 WS6
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