6 pack, or 4bbl?

Hey guys, new here and looking for some advice. I have a 74 duster I am swapping from slant 6 to 340. I really want to go 6 pack, but I'm unsure of my cam. Right now it's an early 70s 340, eddy performer rpm heads w/ 202s, 727, 2400 stall, 8 3/4(not sure on gears yet, but will eventually be putting some mid range gears in it). I'm not 100% sure on what cam I have...I know it's a 292, but no idea on lift. Anybody know if this is a decent start for a 6 pack? Or do I need to just keep to the 4bbl with what I've already got going on?