info on caltracs and tire?

[bigdaddy4026]

hi! i have not raced in 15+ years have been jr racing with my son for 5 years, so i have a few questions

i found a stock suspension 1967 camaro with a fiberglass front cap,that i am building for my son (and i get to get in till he is old enough), trying to start with suspension and work my way up, it will be set up with a
12 &1/2 to 1- 355 small block , th350, 8inch converter( the 1st owner said 5300 stall), 488 gear,

looking to see what size rear tire should i run (30x9?)

i really don't want his 1st car to leave as high as you guys ,so can i use caltracs (or something similar) to keep it down and still be consistant

thanks for any imput at all (good or bad)