harmonic balancer cast vs forged

All slants were internal balance engines cast or forged.The slant balancer has the pulley built into it .You can buy a performance balancer for a 440 that fits but requires work and the belt alignment issues. There are performance Slant balancers from down under but I don't think you need to get into that for your engine.What part number from summit are you looking at ? The Pioneer DA-2250 is a factory replacement and should be fine for a street car.

There are block differences between the forged and cast crank engines so the cranks don't interchange.