Don't know what it's worth to you but here's my experience.
Blew my 455 2 summers ago. Had the local builder do the build for me. His bill included rebuilding the heads (complete), a couple of valves, line boring, 40 over 9.5-1 aluminum pistons, grinding the crank. Double fitted main and rod bearinds, cam bearings, new gears and timing chain, gaskets and seals, lifters (hydraulic), disassembly, cleaning, magnafluxing and reassembly. Here in backwoods Iowa that cost me 3K.
Their's some numbers for ya.
I sprung for the hv/hp oil pump, 8 qt. pan, carb, intake, valley oil diverter, water pump blockoff, cam, roller rockers, studs, guideplates and hardin logs myself. Add another 15 C's for these. Installed my own oil drainback lines also.
Just my experience. Hope it helps.
Peace Man
CESAR