If all your after is fun, stock/super stock isn't what you want to do. The rules spec certain things can/cannot be done. If you are competitive then you have to pay big bucks to for mods that fall within the rules, but cost big bucks for just a few hp if that. Where as a mod that isn't allowed in the rules might cost 1/10th the price and give you 3 times more power.
My buddy runs super stock in a camaro. Was 3rd nationally couple years ago, 1st in division couple years.
He has 3 motors, 2 trannies, 43ft trailer, tow rig. That is just to start the season.
He did the math and it is slightly over $200 per run to race if nothing goes wrong.
Getting your reaction time down where you can adjust based on what pair of sunglasses you are wearing is a must. Getting a turbo car to react consistant, well good luck.
It is a lot of work, and with all racing it isn't a money making operation.