truck engine "should" be a 4 bolt..also another pretty sure tell is if the top trans bolt is drilled tapped..every junk yard truck prefix 350 ive ever bought with the top hole drilled and tapped was a 4 bolt..its not science its just an indicator of probability...ive used it for decades and has always worked for me.....but i cant guarantee it..just trying to help...im no expert
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Mark
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