Guess I'll throw out a couple things on early hemis---------and this isn't about slamming anything said here but to put it out for others that want to do some early hemi stuff and actually the desire to do that seems to be growing but since there aren't many cores------

First thing is bores--------Most people will tell you not to run more sleeves than one on each side--I have run with all 8 bores sleeved-----only precaution is not too much interference fit which will cause some stress issues-------

We only used Summers Bros angle bolted center maincaps

Like tech said-bushings instead of springs on the rocker shafts , but the Donovan stands, needle bearing shafts came with bushings

For rods-lots of people wanting to use steel rods (boats, street ,etc) used 426 rods instead of the welded up plate box reinforced stockers

use adjustable pushrods for setting valve clearance-----takes a couple bent wrenches---

Donovan type gear drive for cam can be adjusted for clearance after align bore/hone

we used bolt in freeze plugs

don't forget the oil diverter above the filter housing

In todays parts for a higher performance rod I'd probably build it with a Barnes internal drysump set up