I hope this link works. Can somebody let me know if it doesn't?
http://photos.groups.yahoo.com/group/kustoms-and-sleds/lst?.dir=/mugsy%27s+292+setup&.src=gr&.order=&.view=t&.done=http%3a//briefcase.yahoo.com/]my 292 linkage
I used 2 pieces of flat bar, 1" wide and maybe 3/16" thick, welded them in a V shape and drilled holes in the ends for the carb mounting bolts. I mounted the V to the two rear mounting bolts. Next I welded a piece of round bar (at a slight angle which I discovered worked best during mock up) at the other end of the V and mounted the stock 1 bbl crank and arm on it. I drilled holes and used hitch pins to secure it. It's important to figure out all the sweet spots during mock up where the linkage seems to work best and move freely. I measured 4 and 5 times before cutting or drilling. Aside from my welded V with round bar attached to it, it's all stock linkage just working horizontally instead of vertically.
Dave, I'd really think twice about the cable. I don't think I've known anybody who liked their cable or thought it was better than mechanical. I had a cable setup once and it sucked!
Good luck either way and my offer to help still stands. Just drop me an email.