I have an 83 swapped, and just used the stock plenum, one of Pat1's pans, a pair of the 2429 mounts, and wired it all up. Been driving ever since, and saving for mods.
Not much to it; if you look closely, there's a blank installed. Knock the blank out and after you've coaxed the dip stick out of its original place, install it where the blank was. Take the blank and knock it into the original dip stick hole and done.
Did you ever find out how big of a rim that this setup would fit under? I'm stuck up here in Yankee land turning the lights back on but still want a set.
Just got into West Virginia yesterday and expecting to work our way north in the next week. We can only do so much. Be patient with us, as in the crews helping get your lights back on.