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I would say that is almost certainly a 302. The balancer is a good clue. A late '68 or '69 as the '67 and early '68 blocks were two bolt mains. Missing numbers are fairly common. It could have been a replacement block, a short-block assembly or the block may have been decked. That's a super find! No problem with your investment here. Congratulations! Robert
 

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Robert your right, sure looks like it may be a 302. The 3956618 casting is sure a 68-69 302 or 350. Wylee check your crankshaft casting/ forging number. It should be 3941178 for a 302 and looking at the pics yours is forged so that is a good sign! Brian
 

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Wylee, It appears you have the head off one side. It should be fairly easy to measure the stroke. If it is 3 inches that will tell you. It couldn't possibly be a 283 as they were not made with 4 bolt mains. The harmonic balancer appears to be factory and that size balancer only came on the 302. That said, the condition of block, crank, pistons and rods are of most importance. It also appears that motor has been into or rebuilt as have most that age. I would have a "trustworthy" machine shop examine the afore mentioned parts. The main draw-back with these motors is parts availability and cost. But to those of us who know and love those motors for what they were, it's $ well spent. Robert
 
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