Trying to calculate E/T

Can anyone on here tell me round about what the stock weight is for a 68 cuda? I've been trying to find it, but no luck. I'm trying to calculate a estimated 1/4 mile time to ensure that I encorporate all the necessary safety features into the build. Thanks in advance.

Oh also, a couple of sites offer a seat saver roll cage. Is this considered a legal modification at most tracks?