If you still have the VIN from the truck, you can tell from that. If not, I believe the P/N on the paper sticker in the back will reference it back to being a V6 or V8 tach. I remember reading a good thread on these over at the FSC site awhile ago...
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91 GMC Xcab LB-Bags/bd/caddy clip SOLD
72 C10 Cheyenne Super LWB SOLD
92 GMC K1500 Burb
72 C10 Burb (ex. Cheesewagon)SOLD
72 C20 Burb parts truck
71 C10 Burb "project"
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