that 302 has another 100k in it easy!
Put the blower on and have fun. I have a vortech on mine and LOVE it!
When I first built the Cobra, I didn't have any money (still don't) so I gave the donor engine a Krylon rebuild and threw it in with 143,000 miles on the ticker!
The idea was that I'd build another engine as time/money allowed. It ran great,
oil pressure was good, and compression was good. It wasn't long before I wanted more power, so I put a Vortech on. I also started building a new engine, since I was sure the old one wouldn't live long.
WRONG I finally just replaced the donor engine w/ a new 306/Tremec combo.
I ran it VERY hard for 22,000 miles, about 15,000 of those were supercharged. It still ran like a top when I took it out.
The key is to avoid detonation. Regardless of what Vortech or Powerdyne says, you WILL need to upgrade your fuel pump (GS340 in-tank pump works great), injectors, and mass-air meter. I would also recommend a good aftermarket ignition with boost retard. MSD and Crane both make nice units.
Be careful though, boost is like crack! Once you get a taste, you want more and more and MORE.