This has been sitting here for a while now. So I thought I'd do what I can. Here goes: Based on what I see in my new '91 Subaru Sambar, I doubt it. It's a pretty simple vehicle. From what I read here, the only EFI engines in mini-trucks that far back are in super-charged Sambars. By "have a computer", I'm assuming you mean EFI. If you actually meant a computer... Well, a desktop computer should stick out no matter where it is, but there are a few places on a mini-truck that you could jam a laptop and not notice. Check on top of the spare tire.
hey...i don't about the lap top but i think the only trucks from the early 90's that would have computer are ones with EFI mine has points and no computer. the computer manages the EFI HTH