Where's the computer in a 85 Silverado?

[Bryan64Impala]

I ordered a new computer for my truck and the one that came in was the one you exchange the chip in. Mine is a carburator with a 305 with a 350 turbo. I heard it is everywhere from behind the radio to behind the pass. kick panel. The only thing I found that looks like a computer was behind the glove box.I even took my instrument panel out looking for it. Just wondering if that was it. If so I can't seem to find a new one. Seems no one around my area knows exactly where it is or what it was I pulled out. Thanks for any help! Sometimes I lose fire and I have a new dist., cap, coil, etc. Was told the computer might be my problem? Just trying to find one.

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1970 C/10 sb fleetside
1968 GMC sb fleetside
1964 Impala SS
1969 Camaro
1985 Silverado (daily driver)