Rx-7 problem... Can anyone help?

Hey guy's, i just tested out a 1st gen. rx-7 with 13B bridgeported. Fast ride... But this car through shifts had a weird lag after the shift between gears at low rpm's or stop and go driving. The owner said it's the jet's in the carb, dose anyone know prices for these 'jet's?'

This ride was hella fast, he told me it's only pushing 180+ though and can be pushed way more.

Let me know if you have any info and prices would be greatly appreciated!

Thanks, peace!

-danny boy