Ok, short story:
We are moving a .co.uk ecommerce site, to its equivalent .com. We had to buy the .com as it did not belong to our client.
The .com had some semi-relevant links. i.e the links were about the subject of the sport but they were targeting the US market. Some spammy links have already been cleaned up and disavowed but we kept the good links.
Now, WMT is obviously reporting 404 errors as it is no longer finding the target pages of those links because we put the new site on there.
What is the best thing to do with those links? They don't have an 'equivalent' page to redirect them to, and I am a little worried about redirecting all of them, (around 70) to the homepage. Do I just 410 the pages and let Google drop the pages gradually or redirect? just create a 404 page? Opinions please?