I'm looking to swap out my sbc and 700r with the BBC and 4L80. I already have the complete BBC and trans. I was wondering what I can look forward to as far as expense and time. The engine and trans were out of a 69' 2wd Suburban so I think that I will have to get the tail housing changed. As of right now I have a 203 which I think I will keep so that down the line I would be able to get a 205 and hook up a doubler. What about the total length of the whole thing? I'm puting this into a 75' Blazer with a six inch lift and 36's. I have thought of going with a 8" lift to get some more room for 37"-38". I know that ORD has the motor mounts. I'm told that the engine put out about 500 hp. I have a D44 and a 12b, both have 456's and Tru-Tracs. How long should I expect the both to last? Thanks for the help.