Newbie, Buying my first. 72 GMC K20

[Joseph2001]

Unfortunately the SPID label is worn so I can't read it, That was one of the first things I checked. All original parts are staying. The thought of cutting the Dash up is disturbing, They make a Bluetooth radio that will slide right in place of the old one. I believe it is a 350 now that I've done more Research. Also, is there another location I could find the Model number? Since the SPID is worn I have no way of telling what factory trim it came with or anything else.
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