ENGINE SWAP

I'm still worried about breaking my tranny it was just rebuilt to handle 450 hp with a 2500 stall and a Gear vendor over drive. The rear end is 8 3/4 possi with Richmond ring and pinion and 4:10 gears.
I'm worried about all that torque 500 is a lot.
Then how about our iron headed 408. It's a great street option also!
BluePrint Engines 408CI Stroker Crate Engine | Small Block Chrysler Style | Dressed Longblock with Carburetor | Iron Heads | Flat Tappet Cam