Okay - I am a bit stumped here.... You say a small motor and 200 mph range..... Would we be talking a small LOW revving motor or a HIGH revving motor?
My "dreamwheel" says that, with a 28" diameter tire and a direct drive top gear in the transmission, assuming NO tire slippage, in order to go 210mph, you would want a 3.00 - 1 gear ratio at 7563 rpm.... or a 3.07 - 1 gear ratio at 7740 rpm.... or a 2.56 - 1 gear ratio at 6454 rpm.....
My turbocharged 2 liter Dodge engine was an 8000 rpm engine..... it never actually got run in the lakester but it was my expectation that I would have been using a 2.80 - 1 or a 2.86 to 1 rear end ratio to go 235 mph (which was the record at that time)...
So, if possible, please provide us with a few more specifics on engines, expected rpms, transmission to be used etc and we could be a bit more specific with (potentially highly opinionated) advice....