Hey guys, I'm new to the board just today.  I have a stock 1980 chevy K10 and was wondering what was the largest tires I could fit without rubbing. I have found mixed opinions around the web about 33/10.50/15 being able to rub or not.  I apologize since this has probably already be discussed. any info would be appreciated.  Also, I have tossed around the idea of putting 3/4 ton springs under the truck.  Would there be any problems with this?