I'm installing my new crate 460 and have run across a couple of issues with the gasket set that was supplied with it. My timing chain cover looks like this:

The gasket that came in the set has two curved slots like this one:

The channel that is supposed to be covered by the small curved slot in the gasket is not curved like that so they do not line up. I have looked online and cannot find a gasket with a straight slot. I have found one with no slots, however:

What should I do?
Another wrong part in the gasket set is the front oil seal that goes in the timing chain cover. Does it matter that the one I removed has a flange and the new one doesn't? I haven't been able to find one with a flange. The valve cover gaskets are also wrong but the old ones are still fine. Were there different valve cover options on '97 460's? Mine has one tab at the end and the ones that came in the set have many tabs all the way around them.
Thanks.