How old are you?
You can build a 9 sec car for $10-15k these days but if you can't find a 1" chain your going to need to have it weigh in at 3000lbs or probably less.
If your really serious, 400-500whp is pretty simple when you have cash.
I would go:
First look into this: Matt M bought a 9 second monte carlo build from an owner who couldn't complete it, here is the motor that was going in it, you could probably get him to switch it to a ST5 cam: ZZ Performance
Stattama turbo kit - tell matt m your mod list, he'll set you up with a proper sized turbo.
Oversized intercooler that comes with the kit
65# injectors
PRJ fuel logs
Racetronix fuel pump with rewire kit
3" electric cutout on the downpipe
Wideband, electric fuel pressure guage, oil pressure guage, aeroforce guage or just constantly scan the car with hptuners/powrtuner.
As far as trans, your ****ed without a 1" chain, like I said, if you can get it down to one of the lightest grand prixs ever, then a 7/8ths chain may hold. I would go to Dave at TEP or a reputable builder of 4t65e's. There are a lot of tricks to getting these transmissions to last and your going to need very high line pressure to shift this power.
If you don't have a good tuner, your ****ed as well.
