I believe the internals are forged. Id have to check. Like i said, i know many people who have been running nitrous for years on these motors with no problems. Compression checks have come back good also.
As for drag racing, i dont really have much experience with it. My buddy who has the identical car to mine, a purple Sv, has made 100's of passes. His first run he turned a 13.7@117, with practice he got down to a 11.60@123.
The 6.0 interior is the nicest, but the Sv exterior is the coolest. If you want the 6.0 dash, you can buy a 99 Sv.