RB Motor In a 1965 Dart

I don't know if this is verboten or not..........
go to www.bigblockdart.com and you will find the answer to virtually question you will have. The archives have a lot of pictures showing what members did when they encountered issues.
The big problem you face ( yeah , me too and I stayed with a small block ) is using an early A body. Much tighter than '67 and up.
Anything can be done........it is up to us to decide if it is worth doing.
But you are not alone on this one.