Tire experts needed

[treilley_at_bankmark@conseco.com (treilley)]

     I need to replace my 2 front tires on my Q as a lesson well learned 
     from not keeping up with my alignment.  What I need to know is if it 
     is OK to put 2 new tires on with 2 used tires.  The used tires have 
     about 3/32 less tread then the new tires.  All tires are same 
     make/model/size.  If it is OK, should I put the new ones on the front 
     or the rear?
     
     BTW I think this was a result of angry gods.  With the turn of the 
     weather, I have been driving the ragtop alot!
     
     many TIA
     
     Tim 90CQ, 77Spitfire