I am wondering what the difference in weight is for a Chevy 350 with Iron heads and an aluminum intake vs the Buick 3.8 V6 as it came in a G body? I am thinking around 150 lbs? Also, how much weight would aluminum heads take off? Aluminum water pump vs Iron water pump? I am trying to determine around what my car will weigh when finished vs stock which was around 3200lbs (V6 Brougham 2 door with A/C, power windows and seat), and also trying to figure out a rough approximation of the weight distribution, and how much better it would be with certain lightweight components. Those components would be: Aluminum radiator support, aluminum bumper support, aluminum hood, aluminum/plastic radiator, and some or all of the engine parts listed.