could the intake be holding my low end down?

Thought I had a dual plane, but turns out its an Edlebrock Torker II 340 single. This 360 w/3.55 SG seems a little sluggish off the line, could this single plane intake be the cause? The cam is not wild and its running on a built 904 w/cop car converter. The engine is fresh, and I dont know IF the stock 360 pistons were replaced.