SB vs BB who wins?

I's go with the 400. A good 400 built right I think would handle more hp. Especially the early ones. Assuming these cars and engines are built with parts that complement each other both designs power will be similar cfm, cid to hp. Power adders are avail to push the engines to their blocks limits. I think a cross bolt early 400 ends up the better choice and can be done for about the same cost of the stroker kit, If you can find one. My best engine was a 400. My 2 cents.