Mopar 408 cam ??

I'm assuming that this is a non magnum (flat tappet) engine.
Your build is similar to my 408. Mine is a flat tappet hydraulic and what I did was call Bullet Cams and had them grind me one based on the info I supplied to them.
There's 2 good reasons that I can say for doing that. One is when you buy an off the shelf cam many times it's just a Chevy grind on a Mopar core plus most custom ground cams will be made for the Mopar large diameter tappet.
And yes I agree that your 650 carb will be too small.