tire question

[Mike Duvall <duvallcom@sbcglobal.net>]

I bought a 64 mgb and it has a mixture of tires all with good tread but 
old. The real bothersome thing is they are different sizes.

2 P195-70 R 14  Gajam Tunggal
1 P195-70 R 14 Dayton Quadra
2 165 R 14 Delta Eurosport

The 195s seem big. It doesn't seem correct to mix widths. Any 
suggestions about what to do?  I thought about trying to find a cheap 
195 and then use one of the 165s for a spare.  Are 195/70's ok to use? 
I don't care about the speedometer...

Mike