You can run a 4.75 x 4.500 (604) and you can use aluminum rods, they must be the radiused Bill Miller version or equivelent. I have discussed this combo with Scott Koffel. He has built several. poppaj

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AA/NSS 65'Coronet "Whompin Wedge"
Pop & Son Performance 557" B-1 power
John Holt Chassis