DH, the 'Guppy' Tynes don't have the water-meth injection which makes them pretty useless for the Belfast in any sort of hot/high conditions at T/O.
The Tyne 515's from the Guppy are also air start as opposed to electric starter motors on the Belfast Tyne 12's. Also, different bearer mountings and many other things not compatible. I think Tyne engines are still in use by the Italian air force, so someone somewhere must still be able to rebuild them.
The Belfast was a great aircraft if you wanted to move a packet of RyVita from the UK to Mazira. Eff all range (900 miles) fully loaded. That's why they were all fitted with in flight refuelling probes, which Marshalls removed during the transfer mods for the civilian register.