Best 60-66 pickup static drop options

[NewType72]

A buddy of mine just picked up a 66 chevy c-10 swb 2wd single cab fleetside pickup. It has a fairly decent base but were looking to lower it substantially, say 3-5 drop with just a static drop would be his goal. Here are its specifics

Truck/trailing arm rear suspension
A-arm front end
Power steering
Power brakes (looking for a big brake conversion not high end though)
V-8 700r4 combo
5 or 6 lug possibly (depending on wheel options)
18-20" staggered wheels (no width yet)
DO NOT want to cut up the bed

Simply looking for the best drop kits, spindles, springs, shocks the works.
She's a blank slate so were just trying to map it out right now.