I think the question was, would it be possible to go .060 over.  The original post says he has no plans to do that.

I'd much rather have the thickness and the ability to machine later on.  10 hp is too easy to get from other ways.  That's an air filter base change, or a carb spacer change, or an A/F ratio change.

Depends on the horsepower per cubic inch, but a .030 over 428 block with a 4.25 stroker crank will be right at 462.  At .060 over just under 469 so we'll just call it a 7 cubic inch difference.  Assuming we have a build that produces 1.5 ponies per cube (2019 Blair Patrick FE build anyone?) naturally aspirated, 10.5 additional horsepower.  This is a super simplified comparison, but it gives a basic idea.

I think that block could easily go .060" over - Jay

Well, my client is one that liked the sound of the engine in 4th gear....at 100mph. Honestly I can't tell what gave out first. Pushrods were tangled up in the rotating assembly and lifters were in pieces everywhere. The car and engine only had 12k miles, and was built by Shelby American. I'm sure he'll take better care this time. We're getting close to $30k in parts....