67-72 Control (A) Arm Bushings?

[DJ_Baar]

I got a set of '71 2500 (3/4 ton disk brakes parts, like spindles, & control arms, etc.,) when I bought my '67 Chevy C20 (3/4 ton with drum brakes), a couple months back.
I am in process of the conversion & repairs to suspension/steering. I already installed a new CPP master cylinder & booster, and now working through changing suspension/steering changes to accommodate '71 spindles, etc....
I have a couple articles like http://www.earlyclassic.com/tech.asp...20That%20Truck and http://www.classicperform.com/discdrop.htm . (I don't care to drop this truck.)
The control arms from '71 are in better shape than what is on the truck so opting to go with them. The lower A arms still have shafts in place and frozen. I started with 3/4 inch long ratchet on both then went to impact and got one side to move on one side with impact but other side froze good. So you see in picture soaking with penetrating oil. Is this normal and recommendations on changing bushings on these.
One picture is existing drum brakes (only shocks removed) and A arms soaking w/penetrating oil.
I will further clean and paint before install with new bumpers etc.... I am replacing power steering control valve, power cylinder, and pressure hose, along with new inner (for 67), outer (for 71) tie rod ends, and sleeve (for power steering).
Any helpful feedback is appreciated. I looked online and didn't find much help so far.

R/
DJ