I'm not going to beat the dead horse about which suspension is best. I think we all know, but 2-link systems work and done right, is good for a cruiser and they can handle a fair amount of power.
I'd probably look at a 67-72 chevy truck with the trailing arm set up. The 67-72 long bed was 127" wheelbase and the CC Colorado has a 126" wheelbase. Not sure if the trailing arms are the same in all versions (I believe they are), but see if you can grab a full set up at the junk yard for mock up. To help eliminate the pinion angle issue (if you aren't already set up like this) look at a 2-piece driveshaft (with carrier bearing). I know the this helps with some pinion angle isues that get brought up with 2-link setups.
A longer trailing arms will help with the articulation and better for the pinion angle than going shorter.
Good luck and post up some pics if you go this route.