cudabob,
thanks for the links. These hit the nail right on the head! I have a copy of the 6 pack tuning article somewhere, but had forgotten that it talked about tuning with and without intake crossover heat.
Concerning the discussion in the first link, I remember my 76 Plymouth Volare with 318 two barrel had an electric hookup to the choke thermostatic coil spring. The service manual has some good pictures of this setup and short of the fitment issues, looks like it should work. I'll probably run the stock choke six pack setup for a while and see how it works out. Since I live in a moderate climate and don't use the car as a daily driver this may work out ok.
thanks again for your help.
Dave