95 summit 670 track install

I recently purchased a 1995 ski doo summit 670 for next to nothing. It came with an extra rear suspension setup and track. The track that came with it is a 136x15x2. It is a 2.52 pitch.
All I want is to put the new track, but it would be nice to put that newer suspension on. I don't know much about sleds, but I can clearly see that the 2" lugs will hit the tunnel. My question is, what front sprockets will I need, and how do I mount the different suspension up?

I was told it was off of a rev. But I think it came off a newer summit