Am I even close?

I think 14's will be possible....What type of heads are on it? That motor build with that cam should be around 380 HP with a good set of heads....However, that carb is too small for your application ... I would also not use 273 exhaust manifolds on it.....At the very least a set of 340 Hi-PO manfolds but a set of headers would be better......I think if you fix these two things you will be in the 13's