Gathering up parts to build a big block. Here`s what I have and what I`m thinking of:
1998 454 Gen VI short block.
9.0 : 1 Hypereutectic pistons
Stock rods with ARP bolts
Stock crank
Vortec heads (stock)
Hyd roller cam 230/236 .547/.547 on 112 LC
RPM Air-Gap intake
800 Holley
MSD ignition
Stainless Marine Hi-Torque III exhaust

5200 rpm MAX

Hoping to see 375-385 hp

scrap the hypereutectic pistons for some forged ones and it sounds like a good combo !

Just guessing, you'll make at least 425hp

I have to disagree with my friend 26Scarab on the pistons. I think for what you are running they will be just fine. They will limit you however to how much additional power you may want to add later. Also, I don't think the MSD is required. There are many threads on MSD's on this website, do a little research. I think you will be up ito about 425-440 HP about 500 ft/lbs with that combo you mentioned.
Good luck

Why do I here you guys using Hypereutectic pistons. I feel they should be called "Hyperpathetic". I have seen my share of failed Hyperpathetic pistons. Spend the money go forged.
MikeW

Save your money on the MSD, the stock Mark 4 ignition will be fine. If you really want to add ignition, go Crane HI-6M. Dont forget real big flame arrestor. and plenty of air to the engine compartment.

I guess I need to qualify that with failed in high performance applications.
MikeW

MikeW,
Sure, I will agree that ultimately forged is better than hypernutectics. If you are going to say in the HP range that was described here, a good quality hypernutectic should be fine. The main thing with doing an engine like this is the quality of machine work and attention to detail during assembly. Balance, line bore, use torque plates when finishing the cylinders. Yes, under the wrong application the you can break anything.

I agree with formula31 about the ignition box you won't really need one. When we were dynoing my cousin's 454 with about the same specs as yours---he had the stock Merc distributors (I think they're called the "Thunderbolt"---right?) anyway, we hooked up one of my Crane ignition boxes and made a few pulls and it didn't help one bit for his combination which made 461hp @5100rpm. The only place where an ignition box would help an application like yours is in the idling department, it will idle better, but I don't think you'll need it for that either. BTW, I think you'll be fine with the hyperutectic pistons with your comp ratio,rpm and application. As someone else said; good machine work and attention to detail during assembly is extremely important. Best wishes

That is probably just a smidgeon to much cam, with a 454 you will make peak power at about 5500 rpm if you want to prop for 5200 max a slightly smaller duration cam will make more power in the 4500 to 5200 range and more torque from 3500 right on up , that cam would be better suited for a 502