There are cheap 4agze's abound. I bought a series 2 (AFM/DLI) one a few months ago in very good condition (looks barely run) with complete with uncut loom and ECU for $650. The only problem was that the head was off. That doesnt matter though because its sitting on the bench as the basis for the 4AGTE.
Then i found another one with a freshly acid dipped and honed block and complete factory S2 4AGZE internals. However it came without cam covers 1 valve, 2 buckets or the S/C, still had a complete loom though, i figure its good for development/spares purposes. I grabbed a 20Valve too off the same guy and got the lot for $950
There are bargains to be had, and I find Toymods is definately invaluable in the search.
As for the Super GZE, no I havent built one. but I think these parts would go quite well together. I'll eventually try it, maybe as my hillclimb/race engine. However id probably look at trying the 7AGZE route but setup the same.