[mysticmissle]

My buddy is fighting a stumbling problem on his 406. he currently has a edelbrock rpm, ported kre ds and a hydraulic roller with 4-7 swap, forged ohio crank and on e85. fairly new combo but not entirely.
Previously had same intake, non swapped cam, unported heads and pump gas and tad too much compression and his N crank paid the price. car had been 11.60s shifting it in his 65 gto.

he has been playing with carb and timing, and even swapped carbs, and distributors. No results, except issue not as bad with less fuel (jetting etc). but car is now a dog and lean.
No one considered the intake and the cam swap until now.
has anyone run into a similar issue with dual plane and a 4-7 swap, where the dual plane is optimized for a different firing order? It makes sense that this is the problem the whole time. We are just looking for correlating experience.
Next change will be a north wind or another single plane.