Trying to get truck to run right

[Dm1pfoy1]

I have 72 c10 with 383 with lage cam dont know specs demon carb w vac advance 625 cfm. 350 trans will run about 3000 rpm at 70 mph. What would make it feel like I "lost" my secondaries? Its while driving that I notice it when I go wot its like there is nothing I will feel same amount of acceleration as just going mid throttle no pop backfire nothing. It did seem a bit lean when driving on hwy yesterday...smelled lean if that makes any sense.....temp didnt change again no poping adding fuel helps but as it is car has strong fuel oder and before when throttle was ok truck ran so rich it burned eyes never smoked though now it seems to run alotbetter but afraid I am leaning out on big end