Thanks for your thoughts guys.
tc , I adjusted the idle mixture and the timing a tiny bit on my 216 and have 20" vac the engine starts perfect and the hot tubes get REALLY hot , maybe I could try lagging the tubes. I have no idea what the Zenith is off. I just threw it on the engine (4 yrs ago) 'cause the original W-1 was weeping bad .
A pic of it is here
http://www.jalopyjournal.com/forum/threads/dustys-truck-stuff.908428/page-3Jerry , I do so hope you are wrong about this issue.