Wow! Well, BB, terrific info as usual. I'm more in the dark now than when I was unaware of the possible suspension nightmare I'm facing.
I don't want to venture into coil-overs now because I don't need or want to change the arms to ones with a coil over shock seat. Just stick with stock arms. But agreed, adjustable coil-overs would be the one-and-done move. But I'm historically too stupid to take good advise. I dunno.
I do think this though: change the rear to new fresh 4 leafs, heard 5 leaf may be too high. I have air shocks too in my rear right now for the very reason you described. Lazy butt. Hoping the new 4 leaf sits the rear higher than the front or at least the same when I change to 1" drop coils. But after reading your post and ORDY's I'm totally guessing. So I'll say a prayer and spend some more money. Yikes.
PS: USMC_Ordy If you're what I think, thank you for your service. My dad's a Marine. Turned 81 last week. Semper Fi
'68 400HO Coupe, 4 spd, 259 interior, Windward Blue. My other car's a Johnson 15 outboard on a '61 Starcraft rowboat... Just sayin'.