15x3.5 on the street?!?

i've run several cars on the streets with those tires. They do have a substantial negative effect on braking, so you have to be aware of that, especially with drum brakes. Otherwise no troubles.

You can find the 165R15s on Ebay and other places. Prices vary a lot.

One thing I don't like about the autodrags is that they don't allow a lot of ventilation of the brakes, which will increase fade, and shorten pad life.