Just buy a 69' Camaro from the dealership, buy all engine tunes from 1 to 3,sports manifold, catylitic convertor, racing soft tyres, and buy the racing mod.
when you buy it, it will equip yuor car with the titanium race exhaust, full customize trannny, and lighten it all 3 stages. then go to your tuning settings and re-equip your engine mods,tyres,and tune the following:
full custom trans:
set top speed to 180-175, it will make you accelerate quicker and keep up with the pack, no high top speed is needed do to the fact that both tracks have tight technical turns without room for top speed.
suspension:
lower ride height to the lowest in both the front and back, no need for anything else because of the Camaro's fantastic handling!
hope this helps!👍