"Did you choose to alter the spring vs the lower ball joint to keeps it looking stock-type?" -Not sure what you mean?

"Do you think that was easier than altering the LCA for a screw in ball joint." - Yes as I'll be using A-Body LCA's I could have modified the later B-Body LCA's but to get the geometry right( roll centers) I needed to get the ball joint closer to the spindle pin.

"Is that a Howe take apart adjustable ball joint?" Yes
http://www.howeracing.com/p-7933-howe-22418-fits-k719.aspx