In theory it should. As far as I know it is the same engine block and gearbox; so by fitting the 155 engine mounts to the 164 engine is should fit.
Another matter is ECU, I don’t know whether the 155 1,7TS or 164 2,0 TS will suit the installation. If it’s not the same ECU generation maybe a tuning chip for a 155 2,0 TS though it have a slightly larger capacity (1998 cc instead of 1962 cc)
I’m sure an Alfa Specialist will know.
Good luck and Alfisti regards
Thanks for the reply, the ECU should not be a big problem cause i can remap the computer myself, though it would be easier to have an E-Prom which comes close and i have to figure out if the computer works with the same sensors on the engine.