It's been ages since I messed with anything that has a carb, but if its flooding or running rich when warmed up, it sounds to me that your carb needs a rebuild/replacement. I'm assuming you haven't done anything to increase fuel pressure, and if it has a stock fuel pressure regulator it still works. You may also have fuel tank/system corrosion problems that can be a factor as well - bits of rust particles and/or dissolved rubber/plastic part turds in the fuel system (due to the ethanol they add to gas these days) can jack up an otherwise good carb.
If you're in CT, don't mind driving it to PA and are looking for an honest shop to sort this out for you and NOT rip you off, I'd recommend giving Dave Barringer (sp?) at Speed1 a call. Dave used to train Mazda techs back in the 80's, and knows these cars inside & out. Here's his contact info:
http://www.speed1allentown.com/
898 Old RT. 22
Lenhartsville, PA 19534
Phone (610) 756-3000