Eddy dual Quad

Your motor is mild enough that you won't see any gain and might actually have less performance. Actually tuning a six barrel/six pack is not as bad as you think, the secondary carbs are vacuum, so really you are tuning the idle with the center carb only. With most dual fours you have to set both carbs for idle mixture.

Yea, I know here I run dual fours and I telling a guy not too, but it is a race car not street car. If I converted my car to the street I would go with the six barrel.

Plus the six barrel/six pack set up will hold it's value much better than a dual four set up.

Just things to consider,
Chuck