Hehe dunno... i thopught id add things up to get an idea of your final weight.
I gotta roughly figure about 130 lbs for the iron block and larger throw crank+bigger pistons. other than that, everything else should stay the same, right?
so if you add up your weight reductions:
30 lbs battery relocate
15 lbs a/c compressor
8.5 lbs a/c condensor
21 lbs a/c fan motor
6 lbs air pump
40 chromoly upper+lower a-arms plus k-member
I get a meager 10 lb difference.... with a total of around 120 lbs weight reductions listed... is there something I am missing? i mean, if that is the situation you are working in, 10 lbs cant be any more than the difference between an optima and a stock battery, so I would think no problems but hey ive never been there on that one here so i cant really say from experience
honestly id think youd be just fine with an extra 50 lbs with no ill results other than a miniscule ride height difference. open the hood now and put an extra battery or two in the engine bay somewhere and see what it does?