Use the 970 pan, 1370 radiator, 970 flywheel. You have to do some fabricating for the air intake to get it under the hood. Mine has a late 1070 fitler housing. If your 504 is a later one with oilers you'll want to run close to 5 gal of oil. It will put the oil level right at the F in Full on the 970 dipstick. If you use the 13 tin oil pan you will lose the support the 970 pan provides.
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