This thread reminded me that the centerlink can be an area of concern on a G3 swap. The '73+ centerlink and pitman/idler arm gives more clearance and solved an issue with the idler hitting the pan when turning right.
I don't remember people talking about the issue before the Holley cast pan came out, but one guy did have the same issues with the '72 and down centerlink with the Milodon pan.
Either way, just something to keep in mind when doing the swap.