68 K20 Beyond 52s, Shackle Flip, and Bushings

[lowrollin70gmc]

I'm planning on doing those three things to get the suspension safer on my 68 K20, as right now the front springs are too narrow for the hangers (later model springs) and it has a 4" block in the rear and I'm getting axle hop without even trying!

The parts I want:
First Gen Beyond 52s

67 up Shackle Flip

Questions:
I have no idea who makes poly bushings for the rear springs for a 67/68. I can only find polyurethane for the 69 up springs and I believe those are too narrow (2.5" width instead of 3").

When I put the 52" springs on the front, should I go with a 1/2 or 3/4 ton springs to keep it at the current height as I'm keeping 35s on it and have a heavy diesel motor.