I made up a progressive linkage for my Offenhauser 3X1 on a 235 last summer....it darn near made me crazy but it works good, and when I get some of the brackets trimmed down it will look good too.
This set-up is for carbs mounted side-ways (throttle shaft parrallel to the engine centerline), rather than 90 degrees like a V-thing. The whole set-up cost me lass than $100 in parts, but a whole lot of sweat.
I've got pictures, but don't have a website to post from - if you're interested I'd be glad to e-mail them to you.
