An 89 Burb IMHO would be easier to dump a 12V than one of the 90's trucks. Assuming the 89 is a square body, those would handle and were designed for a 300ci I6 of some sort. I've seen a few with 292 I6's. So that setup would be easy, along with taking one with a 6.2 in it......also easy to do. Just need to beef up the trans!