Not gonna be much help for you, but I have the parts to assemble a 540" hemi for my dad's 4 speed road runner. Very similar to what you're after, drive it anywhere, 18 spline 4 speed, his has AC, 3.54 Dana, etc.
My plan for the bottom end was/is a World block, K1 4.25" crank, Molnar rods, 10:1 Diamond pistons, stock style hemi/six pack oil pan.
Stock street hemi Vanke modded intake w/ a pair of older Carter 750 cfm AFB carbs.
Brand new but unported Edelbrock casting hemi heads...not the newer Vic Jr. heads.
Custom spec'd hydraulic roller cam from Dwayne Porter that's around 250° @ .050".
My intent was to let the mild cam and unported heads keep the power limited to the 600 hp ballpark for a nice all around driver.

I have all the parts in the shop for it...been there for several years now. Dad has basically decided to leave the car alone since he loves the way the 440 six pack in it runs and doesn't think he needs anything more than what it already has.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax