Modern KZ vs Vintage Mod Honda shifterkart 103rd Street

I am in my 2024 Tony TM KZ R2, my son is about half a lap ahead in my 2002 Skusa Superrpo spec mod Honda shifter. We are on worn Levanto tires and I have 25 lbs of lead on the KZ. I catch him around lap six I think, he is newer to shifter and still getting up to speed. Haven't driven here in 20+ years, such a fun track!