There aren't any mounts available for any engine except whats in there allready that is stock. If you want a B series swap you need a lot of money and a shop that has some good skills, if you want a H series you need lots and lots of money and a shop with some real talent!! Either way loads of money and time. Just build what you got or go looking for rare B20A from Japan or Newzealand from 2nd gen B20A or 3rd gen accord B20A.
I know a dude who owns a shop down the street that has done it. A long time ago when I was thinking about doing an H22 swap, I checked with him, and he showed me one that was swapped. The problem is that the drive axles are at a funny angle. He said it's a fast car, If you don't mind paying for new custom axles every few months. Not worth it in my opinion. There is plenty of power in the A20 to move the light a$$ 2g chassis... It just takes a little diggin' to find it.