Probably only some parts of the block would be suitable... if that.
With full Gen1 3SGEs (needing rebuild) going for around $300 on here, whats the point of mixing 2S stuff?
I reckon an early Gen1/2 3SGE has gotta be good for around 120Kw with mild mods like exhaust, intake and a ECU tuned for high octane fuel (or aftermarket ECU).