Engine Decode

HBD

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Joined
Jul 9, 2021
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Car
84 C10
Can anybody tell me what size engine I have. Everything I've seen points to either 305ci or 350ci. I cant get a definite answer.
Top of the block says "MC06800", heads say "3998993" and "C 9 79", bottom of block, drivers side by the trans hookup says "CJB116155". Also bottom of block both sides in the middle say "010". Any guidance would be much appreciated.
 
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