Summit Racing oil

Allow me to preface this post by saying that I in no way desire to begin a urination contest with this topic. Seems engine oil topics always manage to cause a debate, which in itself isn't a bad thing. However, sometimes those debates turn ugly, which is not what I am after. There's my disclaimer.

I see that Summit Racing offers a conventional oil with a high ZDDP level. It's offered in several different weights, and at a very reasonable price. Has anyone here had any experience with this oil? What weight would you recommend for a slightly warmed over 1970 340?

Thanks folks!