With today's oil having no zinc in it, tough to make a flat tappet cam live... Might want to consider a hydraulic roller, better efficiency and longevity! .060" is about the largest overbore to do on a sbc, might want to drop that to .030" and save room for one more overbore someday should you need it. For the street, hypereutectic pistons are great. Connecting rods should have new rod bolts installed and be resized. Just depends on how much money you want to put in the engine on what will work best for it. I'd still check with Chevy on a 305 crate engine, too. Lots less downtime then overhauling the existing, and usually a 3 year warranty with the engine!!!!