I have about the same questions. I should get my swap kit for chevies in today from Sky. Yes YES YeS, i have already studied the Pirate 4x4 page too. I have some more specific questions as well?

Normal swap for chevies: 11" forward, shackle is 4" back
As per SKY on an 83 model: 12" forward, shakle about 1.5"

Can anyone give me specifics on shackle angle on an 83 if I do the standard 11" forward ?

I must know I am picking up my chevies Saturday... woo hoo flex flex flex