FiTech EFI system

Yes its a vac switch to cutout advance till certain coolant temp is reached. Its the joy of working on 80's mopar emissions technology. And the horizontal run on the exhaust is more ideal for my application, which sounds like you are saying is a little better location than close to the manifold. The pace distributor is my backup plan if I can not get the clean signal.
Sounds good! I admit my lean burn technology knowledge is well sub-par.lol my numerous mopar builds have involved placing stock ignition components abruptly in the trash can...but...I can lock a distributor and install a MSD box in about 3 minutes flat however :p