FWIW the 97 Conc that I got ran lousy, prolly from sitting too much. Conc carbs are famous for having teeny tiny EZ to clog passages.
Being a lazy bastard (the carbs needed to be r/r for cleaning) I tried a # of the diff snake oils, Seafoam, Berrymans, Techron, etc. Nothing seemed to help. Then did the Star Tron dance...& eventually it got all betta. Glory freekin halelujah!
Now run it only every 2 or 3 weeks & add a taste of ST, no worries.