can anyone tell me the curb weight of a 1968 BB camaro and the over all length of the car to find out the size trailer i need thanks

You can fiqure about 3500 Lbs. Depending on various factors it could be slightly lower or higher.
A 1st Gen. Camaro is slightly less than 16' long. An 18' trailer will usually work fine, but a shorter trailer can be used depending on the trailer's construction.
Try a "search" on here - this topic has been discussed many times...

Length: 184.7"
Width: 72.6"
Height: 51.5"
Wheelbase: 108.0"