why not go mustang cobra 4.6, they are all alloy and 32v, rev to 7000rpm and have 320bhp, or the supercharged 4.6 32v, and use the mustang t56, at least you are then putting a ford v8 in a ford, use the mustang irs diff as well and you have a nice package, better than the ls1, or if you have the money, the gt500 engines are available on ebay.com, i think the sump is the wrong end on the ford engine, but sumps the other way round can be had off ebay as well