A lot of it will be down to condition of components and tolerances regarding how long it will be reliable and last.
And different tuners will all have slightly different opinions on the same outcome.
A standard crank will be fine up to 700hp if dead straight, even rods and pistons will be fine at 500-550hp.
Your block maybe fine in standard from but it’s a gamble as you can’t be 100% on how good the bores are so I would ductile liner it, and if taking the engine apart anyway it’s not too dear to get done.
Most use long studs but again not a necessity depending on who you talk to
Cheers Paul