Lookin good guys, just a note about the mounting of the Jag rearend. I see you have Heim ends in the two upright rods mounted to the front of the third member, they really should be something solid, as there should be no movement there at all, and you can run another set of rods to that nice crossmember just in front of the new E Brake you installed, good choice there. But it is very important to not have that third member be able to move at all, as it is your radius rods and all, so another thing, make sure that the rear radius rods are just hanging there for looks ONLY, not to do anything..as that will tear up the top mount at the frame if it moves, from the force of the tires moving up and down, the radius rods will pull the bottom arms of the Jag back and forth, not good at all... Those big flapper arms that they had stock, were to keep the top RUBBER mounts from breaking, not to control the drive arms of the axle assemblies. Check it over close and you will see just what I am talking about, save yourself a lot of headaches later down the road.. keep up the good work... PS, You do not need a idler for the alt. just slot the bottom of the mount and swing the alt out towards the frame to tighten the belts, just make sure you have the shortest ones you can get on there first. AND, I have a Rad overflow box, in my bed that is as big as a battery, it holds plenty of water and never lets out any water on the ground if it ever wanted to spit out any... and it keeps the Rad full as it sucks water back into the rad when it cools off, but with a good engine fan, a small water pump pulley and plenty of advance in the timing, you should be running plenty cool... PS, I would get a junk set of headers to tune your engine the first few times you start it up, or you just may ruin your nice chrome look, as anything off will Blue those pipes in a second... Just some things to think about...
Forgot to mention....
PS,IRS is the worst rear end for traction, so do not lay heavy on the gas pedal, unless you have plenty of room for error, and watch for wheel hop, as that tears things up real quick... Best of luck with your project.. I like that oldxcolor, as I had that once apon a time, myself.. along with 7 other colors .. hehe