There are better heads that you could begin a build with. Those heads have 95 cc chambers, so with flat-tops, you're gonna have a low compression motor that HOTRODPAINT alluded to.

I'd start with some of the earlier heads. Here's a compilation from Scott at Reincarnation. He's probably the best Lima iron head guru in the country.
http://www.reincarnation-automotive....s-1-index.html