when i first set out with questions and started cranking the truck after two years sitting i was not observing fuel flow, i primed the line and fuel has been flowing since. i tested flow with filters and without filters as suggested. i removed the carb inlet filter and it was clean and i could blow through it. while i am no expert all i can say is the flow looks very much like the reference video in the link.

i followed carbkings suggested outline carefully (i put a dab of paint on the screws prior to mark their baseline position)
unfortunately it did not improve the idle, in fact it appeared to idle lower.
note-when i filled the bowl with the ketchup bottle as suggested fuel did come out of the little "spring/rubber stopper like assembly" on the top of the carb - however i also noticed fuel leaking out of a small diameter hole in the iron base on the passenger side of the carb base and a small "pinhole" type hole in the iron base next to one of the carb mounting studs. i don't know if this is normal or not or what those holes are for?

being the exercise did not work i returned all the screws to the pre-adjustment position.

i will take the carb to be rebuilt by someone local who has a good reputation. incidentally if i wanted to buy a new carb where would you suggest looking? is the same type of rochester 2bbl carb specific to that motor readily available?

i will no doubt be needing other miscellaneous parts as well so i will create a separate post "parts vendors for these old trucks" this way others can benefit from any good information.

thanks