mopar muscle

anyone see the april o9 issue on the engine challenge? JD E&M built one killer motor. indy beat them out and not by much but JD had only one carb. i`m no authority on engine building but it didn`t seem right to me when you compare the two setups.
anyhow, i was amazed by the size of the oil filter on the JD engine. where do you find a filter that size how does it apply? any ideas, please and thanks.