I ran a 350cfm Holley 2300 using an adapter plate that I hand blended to the Super six intake. The kick down linkage even worked on the transmission. The motor had larger valves in the head with some hand porting, and the head had been cut to increase the compression. I also ran a Dutra Dual set-up on it. All the motor work was performed by Doug himself. It was a great little motor.
One of the biggest performance and drivability improvements I made was to set the initial timing to around 22 and the total was limited to 32. I also had the vacuum advance hooked to manifold vacuum. The car absolutely loved the more advanced initial timing and would spin the rear tire and didn't have any gas knock.
It was still a Slant six though, never got more than 17 mpg and was pretty slow. I pulled the motor on a whim one day and went with a 5.9 Magnum instead. Best decision I ever made with that car.
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