360 build power estimates

I would probably go to the 2.02/1.60 valves in the heads. As far as the converter I have ruffled some feathers but with almost the same set up you have I used a stock /6 converter and it worked great. I would also look more at either the 3310-3 or earlier Holley carb or possibly the 670 street avenger. I personally don't have any experience with the street avenger but have heard good things about it.