edelbrock carb tuning?

haha,
I'd agree that it sounds like a pump issue (at least the off idle issue), i vote for listening to rumble first. then maybe try something else. my one unique, hopefully unnecessary piece of advice is to try one thing at a time. (unless thats properly doing all the carb adjustments as indicated from a spec sheet) (and i'd shy away from anything that involves a drilling of holes in the carb ;p)
thats my nickles worth, keep the change (exchange rate is bad with me anyhow)