Slant dies when cruising.....

i did a tune (rotor, cap, points, etc) it still has off idle stumble. so im getting into the carb. ill backtrack into the dizzy once the stumble is fixed. its an automatic, im liking that i can get some more pep outta this slant though.

i did check the fuel situation. no water. i did not back blow the fuel line.....yet.... only because it seems like my fuel pressure is muy bueno.

this plunger/ spring was not in carb kit. going to track it while carb is taking toxic bath. do the float too?