Allis 180 Turbo

If your 180 injection pump is set for 64 HP output with 2200 RPM top speed, I doubt that a 190 XT turbo addition would gain much of anything. Maybe a couple of HP but nothing spectacular. The 190 engine is set for more fuel delivery for 77 HP and 2400 RPM. A 190XT has even more fuel delivery with the turbo and makes 94 HP easily. Yes you can add the XT turbo but you need more fuel to make things happen. A 180 also has smaller injectors than a 190 or 190XT.

Seems everyone I know working to raise HP on a diesel automatically think Turbo, Turbochargers were developed as 'Altitude Compensation" originally, nothing more in general.  As engines Uprated they became air boost supercharger devices HOWEVER, as noted requires MORE fuel to get the devices to 'Spool Up' where if get too much fuel all you will do is wash cylinder walls down and smoke a piston or pistons.  We built IH Diesel series Pullers in the 1980s, had to O-Ring the Blocks to heads once got to the magic More Fuel and Boost as the head gaskets were NOT intended for the pressures presented, figure on that as your next dilemma once add all the above.

Have to consider valve train and timing of cam beyond pump timing, then the pistons whether or not been decompressed to handle the heavier fuel load and firing shock load.  Not all is basic stock with just more fuel.