My first big block build is still residing between my fender wells. Welded 4.15 crank, LY rods, stock caps, stock 69 block no fill, Ross flat tops, ARP main studs, MP rod bolts. Pieced the engine together in the early 90's. Have freshened it and changed heads, but still has the same lower end. Cam was the fan favorite mechanical Ultradyne NF-69 .640 lift. It's always been best with a shift light setting of 5600-5800 rpm. Have shifted higher but didn't change a thing. Ran 4.56 gears, but after we installed a dominator (discovered our top end poor time issues...choking) our trap rpms went up to near 7k, so we dropped down to 4.10's and picked up + brought the rpm down to a more manageable 6200. If/when it fails I'll build another. Best et to date is a 10.04 at 138 in my Mirada.