I've never really paid anybody to assemble my motor so I don't know what they get for that but I know the last time I had block work done ithe bottom came in at $600 and the heads were another $650. Now if I remember right that was clean, bore, hone, cam bearings, crank balance, resizing rods and mounting pistons. The heads had a valve job, hard seats, new guides, new SS valves. I supplied the new springs, retainers and keepers. The full gasket kit runs about $150. Timing set about$50. Oil pump $75. Then of course you have all the odds and ends. I usually figure another$3-500 for stuff I forgot. Altogether I think I figured I had about $2500 in it but that included cam kit, HO manifolds, and carburetor. These were all pretty standard parts. Nothing fancy. That motor dynoed at 300HP/360 TQ on a DynoJet machine in 2007.