Got quite alot of info about it, will see if I can post some pictures tomorrow.
There were some 40 finished fuselages waiting for engines when the Americans overran the factory. Another two planes, with installed engines (most likely DB 603 E's) had left the factory, where they went and what happaned to them is unknown.
Another three finished prototype C's were found, two of them flyable and one destroyed by the Germans. The destroyed one had the DB 603-LA engine installed (better high altitude performance than the E).
No pre-production (C-0) or Production (C-1) planes were delivered to any operational units. Not even to any evaluation squadrons.
During testing, a prototype, Ta 152 V6 (using a DB 603 E) reached speeds of 547 km/h (341 mph) at sea-level at Combat Power (2,500 rpm and 1.45 ataboost) and 647 km/h (404 Mph) at its maximum boost altitude.
Using emergency power (2,500 rpm and 1.95 ata boost) it reached 617 km/h (385 mph) at sea-level and 687 km/h at its maximum boost altitude.
C1 weight would be 5322 kg (11708 lbs) fully loaded (including full fuel, guns and ammo aswell as MW50 system filled up). 2x Mg151/20 with 150 rpg (cowling). 2x Mg151/20 with 175 rpg (wingroots) and a Mk 108 30mm cannon with 90 shells, engine mounted.
The DB 603 was planned for the production versions and the DB 603 L as a stopgap untill the LA was available.
Will give more info later.... "24" on TV now.
More over. The plane looks more like a Dora/Ta 152 hybrid, that would mean a new 3D modell so no go in just changing the H for a C. Second, the plane ever entered production.