Howards cams has a number of single pattern cams and I think the lunati street master line is all single pattern. Don't just look in the summit catalog. On thier website I think single versus dual pattern is something you can filter in a search.

Also go to the sites for lunati, comp, etc.. and download their catalogs to look.

FWIW I don't recall magnum heads prefering single pattern, I thought the 308 LA head was the only one that ran better with single pattern.