polished/shot peened rods: were the bolts replaced, and with what?
What blower? what manifold?
Chamfered edge meaning around the bore edge? Leave it be, removing metal reduces quench.
Just my 2¢? The lower end is OK, 20 psi is only 250 hp.
Read Santucci's book:
http://victorylibrary.com/mopar/Mopar-books.htm#CI-LS2