I say keep the SVO. My 99 Cobra with light engine mods is sitting at 301rwhp. The shop I trust with all the work on my car owns an 86 SVO. And his with some serious work is sitting at 386rwhp. Keep in mind the weight difference. He can spank almost any Mustang in AL. Plus you have a car they only made for like 4 years, and it's already a super rare classic. IMO if you're getting a bug, yank the motor, stroke it, change the intercooler, freshen up or beef up the suspension (Watts link Cobr brakes, sfc) and destroy GT's with a little 4 banger. Like I said I have a 99 Cobra vert and I'm entertaining possibly trying to find a SVO or a GT Turbo to play around with.
If you want check out the guys shop who owns the monster SVO
http://www.svpu.com