Stock Magnum 5.2/5.9 camshaft w/carb?

When you get your hands on the Thinder AVS you will see it is basically a modified top for the AFB. The adjustable door is a really good improvement over the counter weighted AFB door that can produce a bog. Also, the 650 rating, I think it is an Edelbrock marketing thing.
I maybe wrong.

Sorry, my bad on the carb description. It was a Holley spreadbore. Just like the pictures one above. I believe it was a 4010.

On the exhaust, use what ya got if price is of concern. It would be a improvement over a stock single 2 inch. Win win!