[madmaxx]

No brainer, iron. Until FMS proves themselves with their new 427 go for the Roush or Keith Craft with the DART Sportsman block.

Aluminium can obviosly be made to be as reliable, but it grows more, and in general can't take the abuse of iron such as temperature excursions, like a stuck thermostat etc.

If you are concerned about weight, loose 20lbs, take the washer bottle and other components under the SPF hood which are not used.