The level of Iranian involvement in the development of the Shir 2, aka Challenger, was signing the cheques. They did have plans to assemble in Iran but this would be similar to the Egyptian M1 program.If the Iranians are doing anything in the way of tank developement for the most part they've been trying to their current tanks (Chieftains and M48 and 60 Pattons)in working order.Let's also not forget that before the Sha was overthorne in 1979 the Iranian Army was set to be a joint development program with the British on a tank that we know today as the Challenger and that during the 1980s the Soviets tried to sell T-72s to Iran during the Iran-Iraq war also some Warsaw Pact coungtries also tried to sell T-72s to Iraq and Iran is also considdering possibly purchasing armor from the PRC.
The Zolfaquar to me just looks like an all welded M60 tank. With spaced armour cavities filled without whatever the Iranians can build along BURLINGTON lines.