Randy our RR weighs 3700 with driver and with 615 hp on the dyno it ran 10.80's with street tires and exhaust to the rearend. It was no way all scienced out so I am sure it could have gone faster. It has a J conv, a 4.10 sure grip dana 60, full interior, etc.
The car usually ran 11.0's to 10.90's in normal air and cooler air it was faster. The 60' times were slow at 1.58 best but normal was 1.64's most of the time.
David