What cam would you run?

I think, given this is primarilly a race car going by the parts you have - that the better choice would be a solid flat tappet, single pattern, with at least 250° @ .050 and lift in the .550 range (with 1.5 rockers). A hydraulic will be struggling with the springs you'll need and frankly - you'll be buying lifters, springs, and probably pushrods anyway. You're doing very well as it sits - but expect to need to have the convertor adjusted too.