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the freeze plug thing isnt 100% accurate all the time, but its been a while since I figured out the discrepency, so use caution...
but the balancer and flexplate are both weighted and are dead give away's... A chevy by the numbers sort of book (or a printout from mortec.com) would be an excellent identification tool also.
If the heads are off, look for the siamesed cylinders with the steam holes between bores..
pc
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