A couple questions about supercharging a 440

I think you'll be fine with the cast crank but there are other considerations:

a) Cast cranks are externally balanced so you can't use a blower crank hub if you want to. Stock balancers aren't recommended (SFI rated are) but, if you do, the blower pulley registers are a different size and bolt pattern.

b) Double crank keys (not required) are recommended. That involves broaching another key-way in the crank snout.

c) Blowers will smooth the idle slightly of an otherwise 'choppy' cam. Blower cams have a wider LSA but the 110* will work fine. Just means you'll blow a little power out the tail pipe. Will you notice on a street car? No. Might help it run a little cooler too. BDS even recommends an LSA of 110* in a build like yours.

d) For a street car, no need for custom low compression forged pistons. I'm using Speed Pro L2266F for around 8.5:1 static compression. Snappier response when you're just cruising around (vs some ultra-low compression number).