L88's too! there really is no "L" series...there are just generations...LT1 is 2nd generation, LS1 is 3rd generation and LS2 is 4th gen i believe.

i dont think Z28's came with the LT4, i think it was just SS's, Firehawks, and Banshee's(?)

and no ther parts arent really interchangeable, like honda does with b series to b series, and d series to d series. LS1's are interchangeable with LS6's...but thats about it, and no huge gain from that, they are kinda expensive to mod, but very well worth it! minimal mods, and i mean minimal, put you into the 12's. and contrary to what imports like to say, we actually get decent gas mileage...i mean shit, im supercharged and im still pullin off 18-20 in the city, and 25-28 on the highway.