I recommend...
...using an old engine or a new case and start from the very beginning is for me a question of what you want to build. Normal engines, like the 1,7-2,0l engines up to rates of 130-140HP are nothing spectacular and you can use every old engine you find. After propper overhauling and using the right ingredients, you can have fun for years with your "used" engine.
When you plan on building a real top-of-the-tops engine and you want to use all the best goodies, try to find as much new parts as you can, but even then, an old case, that hasn't been in harsh use can be a good start for such an engine. There are some quality differences in cases, that you can get new now and the ones, that exist from the late 60's to the early seventies.
Modding the mounts for your new engine depends also on what you want to have. In most cases, simple modifications, same as done on the Type 1 conversions are useful and exactly that what you need. It depends also, how you want to use the engine. The spectrum is wide spreaded, but be sure, what you want to have, then I can help you how to mod your mounts!
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