Slant 6 wont idle after warm

A condensor usually results in loss of ign., many times intermittently resulting in dying/restarting & pleasantly awaking the entire neighborhood with a bang! Not that.
A heat riser stuck closed could do something like this, esp w/current fuel, if it overheated the intake enough to cause percolation in the carb. bowl.
Hit Dan's links and read, there is always something to be learned no matter how much You've read/done/heard, follow through.