I had Dave Crower make a custom cam for my ex's slant 6... It was around 260° duration and .490" lift... She hasn't complained about the cam yet... (but how much she knows is limited....)
Crower makes a good cam... I haven't tried them on any of my engines yet... But would not hesitate to....
Unfortunately Dave has passed away since then, but Crower Cams is still in business last I knew...