I'm sure there will be arguments for either. But personally I think nitrous eventually wears down your engine, plus you have to refill it. I would go SC.
If its not DD and just for racing, then nitrous may be better.
chevy runs deep, Don't step in chevy!
67 Coupe 289 - TCI C4 w/2k stall; Holley 4150 570cfm; Performer intake; mild cam; Pertronix HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.