55.2-59 Ported vs manifold vacuum for dissy

[BlouDon]

I have modified the vacuum feed to my dissy from the ported vacuum port on the carb to direct manifold vacuum.

This I did to derive the benefits of full vacuum advance at idle - like I have done on all my cars over which I have this kind of control.

Main benefits:
1) more efficient idle, hence;
2) lower idle fuel consumption (academic I know);
3) less heat being generated for cooling system to get rid of (not an issue on the 235, but a very substantial issue on my V12 Jag, and the 440s in my Jensens .)