FC engine modification recommendations

I'm about the rebuild the FC out of my 812. I have a list of modifications that I've gathered over the years, please share any others you'd recommend:

Porsche valve adjusters
Supercharger oiling modification
External full flow oil filter modification
Install seal locs on all head bolt holes and switch to coarse thread bolts
Install hardened valve seats

Replacing the rocker arm roller bushings with needle bearings was discussed several places but I understand the bearings are no longer available?

Thanks!