I purchased a TA22 some years ago, and it had either in it or as the spare, a GEX2 2T-GEU. The cams are marked 1351 88262, the head has small squish area, as do the pistons. I still have the cyl head, pistons and rods, if anyone is interested.
A local TA22 rally driver, spent considerable time and money converting an earlier cyl head to this GEX2 configuration. The results were fantastic!