I have a 1990 350 SS it is titled as a Sport. Let me explain by saying that it has everything that the 454 SS has they're is nothing about it different except the engine size is 350 Not 454. It has the SS suspension just like the 454 SS as listed on the original window tag the rear end is different than the factory CK1500 in both the 350 and 454 SS are equiped with 3.73 gears wereas the factory 350 has 3.42 gears and even 3.23. Nothing about either engine in the 350 SS or the 454 SS is Super Sport they are both the same as any 454 or 350 engine produced by GM same as in the 350 CK1500 and the 454 in the CK2500 and. CK3500 So basically both the 454 and 350 SS is what it is all stickers to sell a truck only upgrade is the suspension and the red and black trim and the chrome wheels which also came on the GMC Sierra so they're not anything special. Basically in both trucks no matter how much ppl argue bout the topic whether ppl think it's real or not all GM done was added fog lamps on the air dam added trim and put a different suspension and rear end on the truck slapped 350SS, 454SS, Sport on the side and up the sticker price so ppl think they are getting something better. The Real SS is when you take the 350 or 454 SS build it and slap a wipple supercharger on top which is what should have happen from the factory if they wanted to put a sticker like that on it look at Ford Lightning it came with a supercharger. There is a 350SS I own one it looks identical to the 454SS only difference is engine size.