I'm thinking rod bolts and lifters are the weak points.

There are lot's of things that will break if there stock.

Piston can be replaced.
Rods can be replaced.
Crank well I'd say that could take 200+ HP.
Pushrods can be replaced.
Valve springs can be replaced.
Timing chain and gears can be replaced.
Lifters can be replaced.
Oil system well a dry sump can be used.
Valves can be replaced.
Roller rockers can be used.
Aftermarket fuel pump.
The block and head are strong just how there are really.

If you've got the money most parts can be replaced to make the engine bulletproof.

I'm thinking Rocker shaft and pedestal would be the weak point in a high rpm engine.I havent seen aftermarket ones of them.

What we've got is close to the hemi apart from the fact its not crossflow and the valvetrain, but that has shown the be a very bulletproof engine over the years.

If you flat shift at extremely high rpm, ... & miss, you will very likely lose, or at least loosen the flywheel & bust the front pulley.

The fixes are many & varied & include doweling the flywheel, using select fit fasteners to hold the flywheel [zero clearance in the flywheel holes] harmonic balancer & a rev limiter. All of these things together should guarantee reliability, but any one should be a big help.

there bullet proof

only ones i've heard of 'breaking' as such are sprint car motors ...... big hp, high compression and heaps of constant high revs, often in the top end but i got no details to share
would expect to see something go eventually in that set up.

i reckon feral would be one to know the weak points of an A-series

I had a search and didn't find much conclusive about the issues with A series engines
I found a post about rod bolts.
Not an issue for me as I run ARP's
I found a post about valve gear
Not an issue for me cause I run YT rollers

What about the rest of the engine ?
Are the rods up to high rpm and hp ?
Do the blocks split the bores under high boost ?
Are cranks prone to breaking ?

I've never seen a broken A series...... do they break ?
And what ares need attention for big HP ?