That looks like a good donor engine , I used a bare engine block of similar age for my TT repair*, that ensured the parts would fit together with the remaining original parts.
*My failed TT engine was SN #035753 (Type 111), it was bought as a pile of bits, it was missing the crankshaft, piston, con-rod and con-rod bearing. The donor engine block was #012461 (Type 98) which had been used for a RC application by a previous owner, hence lots of missing parts.
Before & donor engine.
Some pictures from the restoration, it's also the only TT I have with the generator end housing finished in chrome.
One of the missing parts was the long truss head screw for holding the generator rotor in place, a new one was machined from scratch, OK I deliberately made it a little bigger in places.
David