The compact Jimmy was the GMC branded version of the Chevrolet Blazer produced from 1982 through 2005. Power from the factory came from a variety of inline-4 and V6 engines, but if you want to go really fast you can find one that has been re-powered by something with 8 cylinders. Find this 1986 GMC Jimmy LT1 V8 offered for $7795 near Skagit, WA via craigslist. Tip from Rock On!
This example of the 1st generation GMC Jimmy looks nice in shiny yellow paint and well preserved brightwork -- but this is far from the average Jimmy/Blazer from the era. A quick glance under the hood reveals a 5.7 liter Chevrolet LT1 V8 that is probably good for 250-to-300 horsepower (or so) and should make some mean noises.
See another properly powered SUV from the 80s? firstname.lastname@example.org