I don't think there is supposed to be a crack in the swingarm, but i could be wrong. The quadzilla has a longer nose so i don't think the plastics would fit. And the 85-86 and 87up motors are completely different. The early motors had a bigger bore/shorter stroke, and they had a half case reed induction. Also the 87 up motors have a powervalve in the exhaust port.
1995 Blaster. Bored .040" , midrange ported, head rechambered, pro series reeds, FMF fatty/Dg silencer, lightened flywheel, +4 timing, Hydro brakes, Lonestar +2 a-arms, Works dual rate G-series shocks, +2 swingarm,. More to come