pos damage if I shear the crank Damp Key???

Street- and I just want to polish it and tinker with it for now 5PSI boost.(learn how it works, tune it, and cruise around)
I have a 440 in the garage that would make a good candidate for a rebuild when I am ready to dial up the boost
Thanks for your input guy,s and Dyers is going to hook me up with a 6-71.(5 miles from my house)
Lookin on E-BAY now for my 600 cfm carbs that were recommended on this forum
I will post pics as i go if its ok its an E-body??(dont want to get anyones panties in a bunch)
I am on this forum because you have been helping me with my road racing 68 DART for the last 6 months. (runs good needs a manual trans to run better)
Now its time for a blower.