HELP...Will not idle in gear

First a little history.. I have a 67 Dart with a Dodge Aspen 225 Super six transplant.. 2 years no problem. Then a month ago car would not start. Ran all the usual checks and was electrical. Looked like a distributor problem so put a rebuilt in.. still no start so I changed the ignition control module and fired right up. Now its time to set the timing. I checked with my brothers finger in the #1 for TDC and made sure the rotor was pointed to #1 spark plug. Then adjusted idle screw and plugged the vacuum line. Put on the timing light and it was way advanced running so adjusted dizzy all the way and got it to +15 degrees. went for a drive and starts great cold start with choke full on. Warms up choke off and idles in park and neutral but will cut out when coming to a stop. Will not idle in gear...
Any ideas? Should I set the timing to +10 or +5 degrees... I set the idle screw dang near all the way in and still does not idle in gear. Right now you need two feet to drive her. Ok for the track but dam trickey coming to the stop light, still frosty here.. help please