"I would like to know any specific issues to look out for."
Here is some info to use when you talk to Ron. See pages 7 and 9 at https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/1341243
The engine (261 cubic inch) has less power hauling a load than the previous carburetor (Rochester) and 5 to 10 percent less horsepower at the top end.
It would be very helpful if Ron could provide HP/torque/CI graphs of the testing Daytona has performed on their UN2 equipped engines.
It could be that, on our stovebolt engines, the Daytona UN2 is decent on a 216, superior (or as good) on a 235 but only tolerable on a 261.