ProComp/Speedmaster aluminum heads

I’m planning on swapping out the tiny factory magnum cam and replacing it with this one.
Voodoo Hydraulic Roller Cam - Chrysler 273-360 (W/ Long Snout) 264/270
So I have a few questions.
1. I know I’ll need to get rocker shafts that are oiled through the pushrods, since my engine is a 96 5.9. Would y’all use 1.5 or 1.6 ratio rockers?
These...
Mopar Chrysler SB 318 340 360 1.6 Ratio Stainless Steel Roller Rocker Arm Set
Or these... (or something else)
Mopar Chrysler SB 318 340 360 1.5 Ratio Stainless Steel Roller Rocker Arm Set

Question 2. Would y’all recommend getting the assembled heads and running them as assembled or buy the bare heads and buy the recommended springs for that particular camshaft?

I’d probably install felpro 1008 headgaskets as well to get as much of a bump in compression as possible since it’s got the stock slugs.