I have a Huffy Cranbrook and which was the first cruiser I built. I mounted the engine with the supplied parts which is NOT the way to do it, but can be done. To alleviate both the tire rub (dish in) and the frame rub (dish out) which can happen using factory instructions, here is a good fix. This mount can be made easily if you have the equipment, or if someone you know does. I can also make one and ship. Other types can be bought from vendors...DON'T drill the frame. Mount the engine a little higher up on the frame tubes. This will do two things...the sprocket can be mounted dish out away from the tire, and secondly the chain will ride at a different angle and away from the frame. What I like with the mount I made (3 of them so far) is that it enables the engine to be mounted correctly. The angle of the mounts to the tubes should be of this...take two correct diameter short pieces (say 1 foot) of tubing or pipe and bolt the engine to them as they would sit in the frame. Now the angle the two pipes make is the correct mount to tube instillation. You can't get this good of a fit from almost all bikes... The angle is 75 degrees. I'd say anything other then 75 degrees + or - 5 degrees would be best to add a customized front mount. With proper fit this allows you to torque the engine mount, secure engine and without over torque. I torque 6mm hardware in aluminum to 50 inch pounds. This is not tight enough to keep the engine from rotating (engine torque) on the tubes so I made a small "L" bracket that bolts to the clutch cover and bumps the frame. Before you do ANY kind of mounting change ALL the studs from the Chinese junk (about a grade 3) to a grade 8.8 (US grade 5). Notice how the chain is routed up and away from the frame, also the correct carburetor bowl angle.
Make sure the wheels are tuned...turn bile over, spin wheels looking for any wobble in the tire/wheel. This is the time to tune (adjusting tension on spokes)the wheel. I remove the tires to tune the wheels. Remember then working with spokes...you tighten them, never loosen them to achieve alignment. The angle iron used on this front mount (between the arrows) is a 1-1/2" rise.