Progressive linkage? We don't need no stinking progressive linkage !!

No, actually both are hooked up to open exactly at the same time, straight linkage.
It is a mild 306 with early heads with Chevy valves, 9.5 compression, and a mid range Crane cam. The carbs are mounted on an Offy low riser manifold, and I never had any bog or flat spots.

Everyone that saw it thought it was overcarbed, and it probably would have run better with one, but I wanted that look, so that is what I did. Fuel economy was about 20 MPG.

A friend of mine has a '29 roadster with a 302 with a two-four tunnel ram. He wrestled with Holleys for the longest time and then ordered two Edelbrock 500's. He later told me he bolted them on, turned the key, and had to sit down in a chair and figure out how the heck the car was running so well, and he hadn't even tuned the carbs yet. He had ordered a few different jet sets to install, and never needed them.

I'm just a multiple carb kind of guy, and have always put trips or 2 fours on every car I have had. But you are right about gas milage.

Don