haven't had the time to take off the pipes yet, did manage to get it to run by pooring some aceton in the carb, do have a vac leak coming from intake manifold ( a tube that runs to the valve cover)
didn't have a stream of fuel from the accelerator pump so probably still have dirt in it somewhere...
second problem making it hard to start is that the electric choke is not on the car (from po)
so will fix leak next week and choke somewhere next month (by the time the parts arrive here)
as for what happens when tailpipes are plugged: if partially power loss and hard starting, when completely nearly no start, i had the rear muffler coming off of one of my prev cars because it was plugged.