[Brian]

I had a problem with my 35, running real ragged etc. I was convinced it was electrical; condenser or similar. I changed out distributors, condensers etc for months to no avail....finally, thought "I wonder if the heat riser in the [twin carb] intake has blown out?"...removed intake and plugged the heatriser holes each side. Viola!! a beautiful thing once again!!
Try the obvious things, if they don't make any improvement, try plugging those heat riser holes.