Dunno . . If you're geared for the quarter (or the eighth) and you're in the lights at 6800, I can't see the reason to twist one to 7000.
If you built the engine for purpose, your cam will dictate where your power curve ends and you either build it to a livable RPM range for a compromise in HP and Torque, or you put together a grenade . .
If you're going to drive the car primarily on the street, being able to wrap it to 7000 is going to cramp your style in reliability, driving ease and fuel mileage and cost.
Back in the day (and I think the physical ruleset still exists) 7200 RPM was the magic number that dictated the expense of a small block chevy. You could get by with a lot of cheap parts, and hypercast Pistons, etc. if you kept it under that number. After the magic number, if it wasn't bullet proof (Steel crank, Forged Pistons, one piece valves, etc) you were just expending ordinance . . and oiling the race track . .
Personally, if I was building a killer motor for my street beater and was going to race it now and then, I'd build a 6500 rpm torker and let it go at that. If you wanna run 12's or better, get serious and keep it off the street . . Or . . (Bite my tongue) Get a Rice Rocket and run 10's anyplace . .