Rover 200 & 400 Owners Club

I hav a '91 416gsi its the sohc honda block. My question is, im lookin to boost the bhp in the long run n figure there must b a fairly simple engine swap i can do for another honda engine.. Wots the simplest swap possible, avoiding changing mounts, drives etc?

The 1600 DOHC is an easy swap, as is the mini-me VTEC conversion, I'm not that well up on teh Jap engines, but a search on http://www.rovertech.net/forum/index.php should find you all the info you'll need as has been done a few times before