Riva red exhaust

I'm looking to purchase a 90 superjet with the OEM 650 engine. It is suppose to have port work done, head milled, rejetted carb(not sure of size), prop, ride plate and intake grate. It has the Riva red exhaust system on it and I'm wondering if Riva offered two versions, (1) for the 650 and (1) for the 701 or (1) that covered both 650/701? I ask this question because if I purchase it I plan to put the 62T/61x 701 setup in it. If the pipe won't work I'll probably pass unless port matching the exhaust manifold exhaust ports is only thing necessary to do. TIA
 
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