Best ifs kit? rms, hdk, gt suspension, or magnum force?

The early k's I did all had modified spindles....I still have a pair on the shelf. You are partially right on why the others modify the spindle.....with their lay out....they have to or it wouldn't even be close.

Then I asked myself....why don't all the other street rod style/coilovers hot rods I see not modify the spindles?......so a new approach was looked at and adjusted accordingly .

On claims of others (not RMS) regarding track width / suspension travel ?......I have heard the claim.....but yet to see it. From the pictures posted of that package...58.5 track width?.... 6.25" suspension travel?...... (IMO) mission impossible.