Hi, I'm building a 68 340 with X heads, pretty much stock with a Eledbrock Air gap intake manifold. I was thinking the Holly 680 Brawler with vacuum secondaries. any input would be great.
The best out of the box carb I have found is the Street Demon. Very similar to the old Thermoquad in design with both bolt patterns to fit either intake flange.
Lots of videos on youtube about these carbs. I have installed several and I believe they are the best choice today for a stock or near stock street oriented car.