I have had a love affair with the Model 64 since I was a kid, because Dallas PD issued them. Hall Street Shootut by Dallas PD Captain E.R. Walt (Ret) dives into this. Both his books should be mandatory reading here.
Here's what I plan on doing to my two S&W 64-6 RBs, and what I will send them off for
I will:
Chamfer the charge holes
Apex Evolution DAO trigger
Swap out an older factory trigger that I will round off
Older stainless cylinder release, unless I can find a second stainless Ed Brown cylinder release (yeah, right)
Glass bead blast the guns (they are icky)
Cerakote the rear sight ledge and trough flat black
VZ 320 grips, black, not sure if finger grooves or plan. Maybe one of each.
Karl Sokol will:
Chop & crown the barrel to 3"
Dovetail and install 1911 front sight I will supply (Warren FO .115)
Stipple the backstrap
Stipple a portion of the side plate (I am left handed and shoot slightly thumbs forward, I shall embrace your hates)