Honda make loads of different length cam chains with that pitch, so head along to your local breaker with one of yours.
They'll probably come up with something, chances are another link or two will do.
While you're there, just pick up a set of barrels with minimal wear, and slap it together.
Only thing to think about is if you also have a head to frame bracket to hold the engine in, if you've raised the engine height you'll also need to stretch those holes a bit to accommodate.
Come on, don't give up, you'll kick yourself if you drop it back to standard now you've got this far.....