A Body Stalling at Idle

They blew out the carb completely, and found no dirt......put on a new filter........rebuilt distributor and new coil........checked the intake gaskets (on top only, checking for obvious leaks) and found nothing.......no other vacuum leaks.......set and reset the carb (Edelbrock 1405 I think, and new).........tried variations on the timing and idle mixtures........

The car still wants to stall at idle in drive.............

They also mentioned the idea of a "lock-up" vs non lock-up problem, as if someone may have put the wrong converter in.........BUT, that would not explain why it just started happening in the past few weeks......would it?

AAMCO just gave me an estimate of $1000. for a rebuild on the 904, including a new converter.........I almost croaked........... I thought it should be around $400. without a converter, and I can buy a good mild stall for under $200.................... Are these guys for real? Has a 904 rebuild gone up that much?????????