I concur, there are a few BJ74s in our club and the 13BT is superior to the 3BT. My BJ60 weighs 6000lbs empty and is pushing 7000 with camping gear, RTT and bike rack on the back. I would never use the word peppy to describe it.I daily drive a BJ74 with 13BT/5 speed. I love it. It weighs 4600lbs and gets around peppy. 0-60 is 17.5 seconds on 33's at 5000' altitude. From what I've read....thats quick for that setup. I'm averaging 21mpg, can chug along 65~70mph all day long. Thats a fully rebuilt 13BT, rebuilt turbo, rebuilt injection pump and injectors....basically about as good as you are going to get with a 13BT/3B/3Bturbo. A 13BT is considered a superior engine to the 3B or even 3B turbo. I'm not saying mine is the best, but finding a donor 3B will probably be quite a few steps down on performance from that. For sure a bunch more maintenance. Parts are getting harder to get, but no impossible. Some parts are impossible to get.