more bench race guessing

[1FAST68]

I built a 6.0L L92 engine for my 68, it is the same one carcraft did that made 550hp(supposedly). I have not got my wheels and tires yet so it has not been driven yet. It has a b&m 3600 convertor, turbo 350, 3.73 posi rearend.
The truck is a 68 fleetside, I am guessing 3800-4000lbs with me in it.

I am going to run 315/60-15 drag radials. I have a goal of 12.50's, if it doesn't I will have to change something.

Does anybody have a good guess of what they think it might run, or better yet has anybody built anything similar?