They do make aluminum 5.3's they were put in the older SSR's. The T56 will bolt up to 4.8's, 5.3's, and 6.0's from 01 and up. The 6.0 is the cheapest option as the LS1 style heads bolt pattern and you get the big displacement. The iron block isn't always a bad thing it can handle a bunch of boost. A lot of F-body guys are putting 6.0 blocks in their cars.
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