Rebuild after 13 years. Help?

I have a 98 GTP. Lots of mods. From what I remember it was high 12s 1/4 mile back in the day. Pulled it apart 13+ years, for a coolant leak. Was still running fair when I pulled it apart. While apart I decided to do a Gen V swap as well as upgrade my intercooler. Today I started her up over 13 years later. It has sat in the garage the entire time. It fired up and the second try. Idles rough for a short amount of time then smooth out. No leaks. Everything seemed better than expected to be honest. I was worried it wouldn’t start. Shortly after the garage started to smell like I was at a bonfire. And I saw white exhaust coming out the tail pipes. And I pulled down the exhaust from the resonator and downpipe. I can see all the crap in the resonator from what looks to be an old mouse home. I got that taken care of refastened up. And all seems well. I took it for a drive around the block just now. it seems to have very little power. It smells rich that I can tell. No codes yet. Any ideas on anything I could have overlooked? I know it’s a very vague question, but it’s been so long since I’ve drove this car.
Thanks