I found this Motor/wheel kit for the build. It's a 3000W Rear Wheel Hub Motor Electric Bike Conversion Kit + Disc Brake for $530.00. 26x4 inch wheel; 48V3000W-50-55km/h(35miles/h). 45N./M rated, 85N./M Max. Has a 60A controller with 24MOPZ Tube.170mm rear dropout and they say it will max out at 35 mph. But running these numbers through a e-bike app, it should do about 43 mph at 60a and 52v. Or I could get a kit from Ebikeling ( that's A Ebikeling 1500w kit on the bike I have now). The cost is about the same for both of them.
I have a 52v 20ahr 40a BMS battery and would add a second battery to match. That will give me a total output of 80a. So the motor and controller won't over work the battery.
As for Tires I will want street tires for the new build so if you know of any 26"x4" street tires please let me know. thanks