No one can provide an answer because you have not supplied details of the design! Need basic configuration, max all up weight and power available at the very least. 450 kts cruise, that is really something and will need big engines even then not sure it's achievable with prop rotors (think of the drag!).
Here is the estimated performance of the AW609 (courtesy Wikipedia) which will provide you with a starting point:
- Crew: 1 or 2
- Capacity: 6 to 9 passengers or 5,500 lb (2,500 kg) payload
- Length: 44 ft (13.4 m)
- Height: 16 ft 3 in (5.0 m) nacelles vertical; 21 ft 10 in (6.7 m) nacelles horizontal
- Wingspan: 38 ft 5 in (11.7 m)
- Width with rotors: 60 ft 5 in (18.4 m)
- Rotor diameter: 25 ft 10 in (7.9 m) each
- Rotor area: 981.75 sq ft (91.2 m2)
- Empty weight: 10,483 lb (4,755 kg)
- Useful load: 5,500 lb (2,500 kg)
- Max. takeoff weight: 16,800 lb (7,600 kg)
- Powerplant: 2 × Pratt & Whitney Canada PT6C-67A turboshaft, 1,940 shp (1,447 kW) each
Performance
Probably you should spend more time on aerodynamics and aircraft and rotor craft performance studies before you get into the tilt rotor design. Your teachers should be able to help you with those subjects.