I used to have one, If it has the o2 sensor on the exhaust, NOT just the exhaust temp switch for the thermo fan run ulp only, usually these models will have a high mount turbo. If it does not have the o2 sensor then it is a leaded model but can still run ulp as all ET's had hardened valves, mine was the leaded model but i ran it on premium ulp for 5 years and no worries. The leaded models will have a low mount turbo.
Mine had a ported and polished head, t25, stainless 2.5 inch exhuast, vl throttle body, vr 4 front mount chiller, hks bov, rising rate fuel reg, EL falcon fuel pump, pod filter and 15 psi boost, killed two gearboxes in its time.