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After you are done cleaning up the accumulated gunk, dirt from the fins that are intact you'll get far more cooling than you are losing due to the broken ones....so worry not and keep going for now.
you said earlier while checking the compression pressure that engine is in good state , and compression test was also +ve , then why you stripped it ?
ok good , i thought you completelly rebuilding the engine , restore all the parts inits original condition , same as when it leaves the factory ,,,,,,,,,,,,i am also stripping my cultus engine tomorrow for some transmition wor,
good that you cleaned the heat riser pipes of the inlet manifold, I dont know how clogged yours were but on my once upon a time 1302 - they were clogged shut and required the gas torch treatment - the effect is that because the manifold is so long the fuel drops out of suspension, the heat makes it sure that the fuel remains vaporised in the air, hence all the correct mixture reaches the cylinders. resulting in higher vacuum in the manifold and icing of the carburettor joint as it sucks on it harder.
the only way to keep it declogged is to drive the engine hard for some time with clean air filter and correct fuel mixture.
btw get yourself a nice flexible stainless steel bristle rifle cleaning brush, it will help in completely declogging the heat riser next time you clean it. (if you look at the factory service literature of this engine it says to remove and clean it at regular intervals)
btw I can bet you can feel the "torque" of this engine now,
