How was it "converted" to a 105, Couch-flyer? If it was done at BME, using the 1mm longer stroke crankshaft, then I'd say your idea is a very good one. Even if it was "only" a 102, upgrading it with 110 jugs/pistons would STILL be a tremendous power increase with a displacement of about 106 cc's and enough power to match the 3W106 in every respect.

I currently have the 110 and a modified 102/106. The 110 is just silly with power, but the 106 spins very nicely too, hitting 6150 with unbroken-in jugs using a menz-s 28-10, and hitting 6650-6700 on a 28-10 mejzlik during the same test session after only 1 gallon of gas through the new cylinders.

I'd grab it and run with it Couch-flyer, especially if the price is low.