You thought right, it is the 5.0 GT engine.
All Mark VII engines were close to the same...well except the BMW sourced Diesel. I nearly bought one of those, kind of wish I would have. A diesel Mark VII + T5 + 2.73 rear gears = high mpg!
There were a few changes up to late m.y. 1987 then from '88-'92 they were all the same, regardless of submodel. I had an '87 LSC with true flat top pistons (no valve reliefs) and E6 heads. It made slightly less power than my '92; 200 hp and 285 lb/ft vs 225 hp and 300 lb/ft, respectively.
Before '87 they had the lo-po version of the s.e.f.i. fuel injection system. And before THAT they had a central throttle body similar to GM's TBI. I'm not sure of the specs on either of those.