Right now I have 91 with 350 tbi but I've started to think about getting a diesel. My K5 is a simi DD no real trails around here. I would like to get better MPG. On govliquidators I've seen some diesels that look like possible canidates but they dont have titles (Use the 91 title and part it out). I'm on the fence about this and need help to make up my mind.