I've been dealing with Jegs and Summit for over 30 years.. LOL. Yes, I prefer Summit. I was looking for the first link I found to the E-heads.
Depends on what all needs to be done, if anything. We'll be getting 440's from motor homes, which in my opinion have stronger blocks with the extra ribs/webbing and stronger ears for mounts. Here is a guy that's used a stock bottom motor home block/heads and just added cam/671, running 10's, and 15 years later still going strong. Don't be fooled by certain things.