Piston Choice

The 190's are domed right? That would leave you with a open head chamber only choice. As far as I know, that would be stock heads, X,J,I,O, ETC.... or W2 heads.
Of course, you could check to see what your mahine man would charge you to wack the dome off.

I have run the 107 piston many times. A closed chambered head like an edelbrock basicly gets you a 10.5-1 to 11-1 engine. The spread can be larger due to where the piston sits exactly and head gasket thickness. >039 should be just fine on many fronts.

On the cam, I think he Lunati will make he best over all and top power.
The Purple Plus is justy comps version of the MP purple. I do not know how streetable or better in the street it is over the OE Purple.
Th OE Purple cams are a little cranky down low. They seem to like a lot of compression fo there respective duration. There a great "Purpose" cam, not so much on street. But power they will make.