grayfather

'95 5vzfe 200k. Orig engine sludged up at 185k. Found another engine and dropped it in (with help from mechanic doing side work). Also did timing belt. Shortly after engine swao, Crankshaft pully came loose while driving. Must not have been torqued down enough. Was able to put it back on, and tighten the bolt. Stayed on for two years. The other day the bolt snapped in half. Half is still in the crankshaft and I need to have it drilled out. The pulley is hollowed out and I am thinking the crank gear may also be - based on reading some posts here. Have not taken the timing belt off yet. I'm looking for a pulley and a crank gear. Does anyone know if the 3.0 pully (harmonic balancer) is interchangeable?