It was a 4 cylinder, anything will be an improvement over an 80hp powerplant.
Parts availability...? You do realize a 2JZ came in loads of Lexus vehicles in the 90's, right? It is super rare I can't walk into any parts store and get a 2JZ specific part same day, or even right then. The only struggle I've ever had for a part was anything 1JZ specific, even then that engine is 95% 7M or 2J parts, the only unique items needed even remotely frequently needed are cams seals and that's once every 5 years....