my best hand fitted motor is 43.5 dia and 43 long. You don't want to run it too hot very long as you can melt the rear oring to the rear bearing and lose preload. unless you have a 1200 it will be to constipated to get maximum rpms.
pm me your address and I have 1 extra shorted cone I can send you for xmas. 46.25mm dia. You could shorten yours 1mm at a time just don't run long over 750 ,less than 700 shouldn't hurt it.