I have the 5.83's, and with Goodyear Wrangler MT/R 31 X 10.50's, inflated to 23 pounds, the speedo is within 0.5 MPH at 60 MPH. I live at 9,000 feet elevation, so the 96 hp you get at sea level in a 1.6/16 turns into about 80 hp - MAYBE - so I have to run it up to at least 5,500 RPM before shifting, and I don't run it lower than about 2,700 RPM or it lugs down too much.
So - you have a 1.6/8 valve, rated at 80 hp (at seal level). You're gonna have some issues with acceleration on 32's or 33's, even with the 5.83's.
It's survivable, just annoying.