Gary,
I believe there were 169 total GT's. It all depends on who you talk to. The Safir cars,known as MK V's, totaled 45 but there were some duplicate chasis made and later finished by private owners. This count also includes the three Mirage GT's. The last and most famous MK I's
were 1074 and 1075 which were Mirage chassis with MK I bodies on them. 1075 won Lemans in 1968 and did it again in 1969. It's been guesstimated that 1075 is worth in eccess of 6 million. The GT's value depends greatly on it's racing accomplishments. For a plain and simple road version of a MK I the price can be from 300,000 to 400,000 easily. The lowest auction price I have ever seen a GT sell for was 275,000.
I hope this helps.
Hersh