340 No low end power

mikess68 said
my guess is the carb and intake. sounds like a sorry carb. Secondary seems to work, primary might have bad pump, missing parts/springs/ etc. also could be some vac lines/leaks around the intake (check with carb spray) then look at timming and dist. could have the timing chain off and can not move the dist enought to get it out and or the vac advance on the dist screwed up. don't really know but these are the1st things Id check out. $0.02 worth

We after going through all the input and advise that everyone posted, looks like a carb issue, at least to start with, only pumping on one side of the primary. Looks like 321 gear ratio, timing at 15 btdc inital and 35 total, no vacuum leaks and compression is good. Will try figure the torque converter and cam and look into intake after the carb is resolved. Any carb advise?? rebuild or replace??
Many thanks to all!!