I decided to do some Google search on the 360's and I found a interesting build. Engine Labs built a 360 with stock heads with 2.02/1.600 with port work. 650 demon carb, air gap intake manifold and a xe268h cam. The best they got was 387 horsepower and 434 LbFt of torque. I tried to load the article her but I couldn't get it to load. I'm not saying that this is true or a fact. But if they got 434 from a mild 360 then I would think that getting the extra 91 Lb Ft shouldn't be hard to get.