You might wanna start with 275/60/15 Nittos R2.
These are good cornering and decent traction with rain traction.
https://www.summitracing.com/parts/nit-107-830
Good reviews to give you some basic insight, Tire Tack does actually testing so those are better.
Shocks and rear swaybar add to the traction. You might wanna try 1 thing at a time and see if you're moving in the right direction. QA1 or Viking shocks are good once you get a tire to hook or somewhat hook. Great shocks on a Street tire are useless since the tire will just smoke instantly no matter how much compression and rebound you can control.
I have the HR Parts N Stuff Rear swaybar on my GN, good god did that make the car launch the way I wanted after I got the 325/50/15 Street R under the car. But most would not like the overstreet, you feel like you're in a railed carnival ride. LOL But the smile on your face when the car launches and leaves everyone a bus length behind in 1st alone is worth it IMO. I'm getting one from Paul to put in the GTO to stop the sideways butt slide on launches.
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69 GTO Convertible, 4000lbs
462ci, 606tq/569hp - 93 oct @ 34 deg (207psi)
11.7:1, KRE H Ports, Lunati HR 282/290 w Johnson Lifters & 1.65 Scorp, E30, EFI, Holley HP + Dual Sync, 12-1 Crank Trig, 120lb Inj & 1000cfm TB, Torker II EFI Int & Rails, PTC 10", Rock Valley SS Tank, Dual 450s, Aerom EFI Reg, Aero Front & Wilwood Rear Disc Brakes, Dougs 1 7/8" & Borla Pro XS 3", Alum Rad & Dual Fans, 12:1 Box, UMI Arms & Viking Berz Fr + Rear CO Shocks, Hella UP5.0 Vac Pump, 12 Bolt, 3.73, 33 Spline
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