1988 CR500 exhaust, and 1989 CR500 exhaust

I am looking at building a CR500AF. I am possibly buying everything from a guy who was going to start one, but then decided not to. The one thing I am curious about is that I have never seen an AF with a motor older than 89. I am wondering if I am still able to use the 88 motor, but use an 89 exhaust? It would fit better into an aluminum frame. I would be using a 2009 CRF250R frame.

There are a lot of 500AF threads and info in Honda Two-Stoke

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