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What would be the correct toploader tailhousing for a 68 302 Jcode, C70R-7A040-A or C4ZR-7A040-A. I think both could fit depending on the shifter plate. The C4ZR has the shifter mounting at the rear. The C7OR has the shifter mounting more to the front and uses a shifter mounting plate. Thanks Korbi
 

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You're dealing with casting numbers. The 302 with four steeps is RF-C70R-7A040-A. The C4ZR-A is not listed, although a -B is indicated for three-speed versions.
 
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