400 vs 430 vs 455 block strength

(If this is in the wrong section I apologize, it's purely hypothetical so I didn't think it neccesary for the race bb section)
I know that the 75-76 455 blocks are preferred for a few reasons over 70-74, but what can be said about the strength/rigidity of 400 and 430 blocks compared to early and/or later 455 blocks? Seems to me that since a 400 can be bored to 430 bore size, in it's natural state it would be notably more rigid than a 455 block, due to the extra cylinder wall thickness. Negating the loss of cubic inches, wouldn't that make for a tougher engine under power adder/higher rpm conditions? 400's should be the rarest statistically, but I seem to find them regularly in this area for sale. A 3.950 offset ground (normally a 470?), the Molnar 6.800 rod, and a forged Olds piston (4.165 bore) stack up to around 10.540 deck height, and make 430 cubes. If my thoughts on the blocks are correct, this ought to make for a pretty stout bottom end that could handle some power and rpm, like in a single turbo application. What do you all think?

 

Watching... I wondered about 400 vs 455 block integrity myself.

 

Larry,
I have come to understand how big of an issue that is with these engines. I guess this is a "best case scenario" situation, say we had a 400 block which sonic checked good and showed minimal core shift, how then does it compare to a 455 block of equally good standing.
Ethan

 

3.950 stroke x 4.165 bore = around 430 cubes, down only 25 inches. Plus about .030" more wall thickness than a normal 430. I understand the stock cranks are quite capable, so coupled with good rods and forged pistons, I was envisioning forced induction. If a stock 455 built the same way could survive 650 hp, then the 400 hybrid would have to handle another 50 or 100 hp at least to be worth the while I would think. I'm pretty good at finding the hardest possible way to do things

 

The 400s will suffer from shrouding the valves if using the larger stage 1 valves. This will hurt airflow alot

 

Naturally aspirated yes but forced not that much of an issue....just turn it up....