I designed and had machined a crank pulley for the common block that utilizes the water pump and Alt. Its about a 15% reduction in size over stock. I am currently working on one that is the same size that keeps AC and PS. I posted on FB and had some interest but I always for get alot of people on here are not on there. Here is a pic of the current pulleys I have made and then a sketch up of what the new pulley will look like to retain the AC and PS.
Alt Waterpump Pulley is about a half a lb lighter than the regular aluminum underdrive with the added adapter.
New pulley will be about 1 ounce heavier but is also about 10 percent larger.
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