new to forum with timberwolf problems

Hey yall, im new to this forum i just picked up a 92 timberwolf 250 2wd that had a bad stator so i changed it and got her running but then discovered a leak at the bottom of the jug so i put a whole new top end gasket kit on it…… But now i have new issues. I know first gear is usually a short shift but the first 3 gears it seems as soon as i shift into them its already revving high and have to shift again. It doesnt seem to level out until i hit 4th gear. It also feels like some slop in the shift and when coasting to a stop it sounds like i can hear a chain drag somewhere. How do i fix this?? Any help is greatly appreciated. Thanks