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Re: 350 blocks
my 78 jimmy isn't (stock 305) but it's supposed to be "period correct" 350 with 4 bolt mains
this is what the back looks like and the front numbers
you can usally blast back there with a pressure washer to see them
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John
1978 GMCJimmy4X4-350/203
1979 GMCJimmy4X2-305/350
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