Factory old iron just can't compete ... ??

Let's talk about horsepower limits on small blocks. Just a guess, 450 for 318 (not impossible but hard to get there) How about 550-600 for 340/360 blocks. Cylinder wall thickness and lower end strength are both important. THe 6 pack blocks have stronger main webs correct? I see @pittsburghracer is making 600 horse out of a small block. Stock block stroker? Step up to a Ritter if you want stronger.