Just my thoughts...I agree the 240 heads are probably the better choice. My thinking on the intake is to go w/ a single plane. This is a 512" stroker w/ smallish heads...no need for a dual plane.
I wouldn't be running an Edelbrock carb on this motor. Holleys don't leak unless you screw something up and you need more than 800 cfm in my opinion. And I like Edelbrock carbs...about to freshen up a 1407 for a mild 440 build I'm working on.
Go with roller cam. Personally I'd go w/ a mild solid roller from Dwayne Porter.