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any year 3rd gen with Z28 or Iroc badging wold have a V8 in it. from 82-86 the base V8 was the LG4. 82-84(? from memory) the CFI 305 and L69 were available as options.
1985 started the offering of the LB9(305 tpi) and in 1988 the LO3(305 tbi) was added as an option. 1987 was teh last year that a carbed engine, the LG4, was offered in an f-body. a few months into the 1987 model year the L98 came online(it was available for order from day one).
1988 marked teh first year that the "base" engine in an IROC Z28 optioned vehicle was teh LB9. it coudl be deleted down for a minor price break to the LO3. this is a very very common option.
as for the GTA's only having been made with tpi. i don't know what to say. i have seen so many strangely optioned cars before that i don't count anything out any more. V6's equiped and coded for the JG1 aluminum drive shaft, Iron Duke 4cyl powered cars with 2.73 gears, i even saw a 1LE at a car show once that had 3.08 gears in it.
gm was not real picky about what they woudl or would not accept for orders. they just wanted to move units. worst part is that their record keeping was very very bad. so it is hard to reserach these things as well.
later
tim
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