91 G20 engine swap with 91Chev Blazer Engine

[donerite]

WE pulled out 350 tbi out of g20 van . There are some things different that we will have to change (Main bracket , therm housing etc. ) The tbi seems to be different ( the bracket for throttle will not bolt on the tbi .The one on g20 has holes to allow the bracket (Could switch tbi but the one on blazer is al ot cleaner and looks newer. Anyway of keeping tbi off blazer? Do I need to change other things like map sensor , oil sensor , o2 sensor ? they all seem to line up with wiring ( haven't installed engine yet but looks like they will ).
When i sort that all out with some answeres I would like to know what to do onces everthing is install (wiring , battery , starters etc : ) will the computer set its sell or do I need to do somthing first ? This is my first engine swap with computers . I used to own 69 Nova when I was younger and would swap engines every other weakend . It was a piece of cake . Not like doing this van . I took pics of eveything vidio tape most of all my moves . I could sell it as book with all the pics.
One more thing the van has power windows and left it dowwn . I would like to put it up but can't get power . Not even sure I should try scared somthing will screw up computer.

Any answeres would help Thanks