Engine swap 318 to 360

That kindov depends on how yur gonna drive it.
But hang on, 1974 is a long time ago. That car could have gone thru many transmissions since then, so as part of your detective work, did you actually slide under there and take a look at what might be there.....?
The stock 904 can easily be upgraded externally, to handle the stock 360. and can be modified internally, to live behind a typical street performance 360.
But to answer your question, the stock 360 needs ONE of two things;
1) either a Zero-balance Convertor PLUS a 360 weighted flexplate to fit whatever transmission is behind it..... or
2) a properly weighted-for-a-360 Convertor, to fit the trans.