305's on an 11" rim

2 inches? 10 mm is 10/25.5= about 0.4 inch.. I realize that this is a profile measurement, but how can the 35 series to 45 series possibly translate to 1.6 more inches? Ouch!
28s are too tall for the front, and "almost" too tall for the rear.
28s on the front;
You will not be able to align the front to any A-body factory alignment specs. and yur gonna run into clearance issues while turning, hitting either the frame in the back or the strutrod in the front and the fender for sure. If you set the front ride height down, you will get into;
lack of caster/bumpsteer/and scrub radius issues.

28s On the back
The front edge of the rear tire will try to wrap up into the body on acceleration. The axle will likely need to be moved back. I only had about .25 inch room on the threads of my front perches. but it was just enough.