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i have 2 crossmembers that i thought were both big block 4 speed. they are not the same but both same height and marked 390 std IMG_7079.jpg
 

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Mike, if you noticed the longer slotted one says 250 and 390. I think that this one is used starting 1969ish? It would work with 6 cylinder 250 and FE engines.
 

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thank you sir
 
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