Big block 383 build!

I wish you luck but...........
Already bored .030? with no pistons to match the bore?
My machine shop will not even touch a bore job unless he has the piston in his hand to mic it for tolerances.
Before you buy any parts take it to your machinist and have them look it over.
And what kim said have the block dipped to get rid of the paint, that is a no-go on a rebuild.