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Old 07-11-2018, 07:52 PM   #6
BILT4ME
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Join Date: Jul 2016
Location: Olathe, KS
Posts: 267
Re: '70 K20 carb options

Look on the left rear of the block for a casting number. This is where the transmission bell housing bolt to the block.

That will tell you the basics of the engine.

If we were to do it again, we would buy the Sniper EFI and pony up the cash for it, as there are fewer issue to go wrong. Yes, there is a learning curve for it, but it works.
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1970 GMC K2500
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