Re: What axe to put 78 in?
I think a 78 would work farily well in both guitars, but one thing to consider is output balance. If your Ibanez has a fairly powerful humbucker in the neck, and you put a 78 in the bridge of that guitar, then they wont balance particularly well. I am fairly sure the ibanez bridge pickup is farily high output, so the 78 will certainly give you a big drop in output compared to the stock bridge pickup.
It will balance fairly well with single coils (of course there will be an output increase though), so it should be ok in the strat. If it was me i would go with the strat.
Have fun. Its a nice pickup, thats for sure. I have had one in my EB Axis for a year, and couldnt be happier.