You’ll definitely want the opinions of more experienced guys than me; but I’m gonna say an 850 - 4150 would be an extremely conservative choice for any 482” mill, especially a healthy Hemi. Would it run good? Sure. But I’m thinking there would be quite a bit left on the table as far as drag strip use. I run a 1000cfm 4150 (pretty similar to an 850) on my street/strip 451, and it runs great. 30 more cubes and the flow capabilities of a Hemi-head..... I would think a large 4500 would be in order.