I've got a smaller cam in my mild NA built 360, ported J heads, stock converter, shift kitted 727, 3.23's and 26" tall tire. Yes its in an Abody, but I race with tools, etc in the car, so I am probably 200# lighter race weight (milan never has the scales on it seems), and run 13.0's in OK air with a best of 12.75 down a mineshaft...from what you've said about it, it pulls harder than a 13 second car...
if you can build boost and get the converter to come up a bit, it will help a TON on the launch..
BTW...kinda killing the sleeper image running with no hood...everyone is gonna see the goods!