Jaynen said:
I think with forced induction and some widers wheels/tires you are not far off an SSM car
With FI and wider wheels / tires he's in SSM but still a long, expensive way from the good end of SSM. Ask me how I know.
The Manic Miata has similarities to your car in fundamental build. It has Koni Yellows and GC coilovers, but the rest of the suspension still could use bushings, etc. It has big brakes and swaybars. FM chassis brace. Not quite as sorted as your car on the chassis front, but solid. 15x9 wheels running used 225/45 A7 takeoffs.
It's got deep Corbeau fixed-back seats and 5-points and a big fat rollbar. At 5'-10" and 275 I strap it on like running shoes.
The Whipple twin-scroll blower makes about 10 psi and is good for just under 240 rwhp / 190 ft/lbs of torque with the intercooler. Torsen, LW flywheel. It goes zoom when you step on it. It's very entertaining to drive on the street, if a little crashy on bad pavement, and fun to drive on the autocross course. I run in SSM locally and can win unless the quick dude in the quick C5 shows up...
...but I've ridden in a well-prepared SSM Miata, and mine is not one. The rollbar is important to me for street use but it is 50 extra pounds mounted way high up. The car needs a splitter that almost scrapes the ground and big wing out back. I should strip all the carpeting out. The EMS is functional but archaic and should be replaced and re-tuned. I need 15x11 wheels, 275 tires, flares, and a Sawzall.
All this would cost time, effort, and money I'm not willing to spend, so I put up with not being competitive. I have fun driving the car as it is. If you can live with that, 240 rwhp is enough and very doable with the engine swap you have plus a blower or snail.
But it's going to be hopelessly outgunned in SSM, probably worse than you are in CSP. If that's a real issue, then the question answers itself, unfortunately.