Preferred carburetor for mild 360?

cranked up the timing until the idle picked up... and then turned the idle down... managed to get it to sorta idle, around 950rpm ... according to timing marks, it's at about 30 degrees advance (with all vac lines disconnected and plugged) in order for it to idle at 950... and it barely wants to do it... hand over the primaries (not sealing them, but restricting some airflow) gets the idle up significantly. Can't find any vacuum leaks though.