CMP = Carolina Motorsports Park?
It is fun! I've built 2 cars with some friends with pretty good success; we actually had some Top 5 finishes. For me the best part is building, not racing, so I'd always suggest wrenching.
Dirty Penny: '79 Datsun 210 (Had a sweet keg sponsor with that paint/tartan scheme)
Black Gold/Sex Panther: Datsun 280ZX (can't find pictures at the moment)