There is a couple of options....
I know poeople who have rebuilt these engines because of snapped chains. There is a very good website (
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) that has lots and lots of information, including part numbers and prices. Interms of a replacement engine, if you can pick up a replacement engine, there is no reason not to swap it in. there is nothing "built" into the engine that only Its ECU will talk to, at the end of the day, its a big piece of metal with injectors, ISCV bolted on with electrical sockets and plugs. if the metal bit of the engine is dead, replace the metal bit! you only get a problem with the ECU and the PATS if you need to replace either of these, but for a "simple" cam chain snap where you have might to replace the valves, pistons, head gasgets, there is no reason why you cant replace the bits or swap in a new lump.
If its the earlier 24v, its very simple, yet long and expensive to replace the cam chain. ( the later one, the 1995 + had two chains, and two tensioners ). i replaced the chain on my 1993 24v, and tensioners without removing heads etc. It was made easier because i had an engine stand, but it was simple ( i have the workshop manual ) the parts were available ( not cheap thought, almost £400 i think in total ) and after droping it in to my capri is started 3rd turn of the key once it had petrol.
anyway, to sum up, if you want to change the engine lump for a second hand engine lump of the same type, there is no problem - its not like you are trying to fit the engine and EFi system in something that did not already have it fitted!
IMHO of course!