engine from inj to carb
 

hi im looking for a bit info i have a nissan 100nx injection but my car is to rotten to fix but i have been offered a anothr car with a better body but the engine is dead well the head is gone on it will my engine fit straight in to the new 1 althou its just a carb and my engine is injection ?

what work would be involved i can change an engine but no sur if its just a straight swap over or not ?
thanks in advance