Lets talk short blocks? Dont know really much about it..

OK guys I just finished up my pI head swap on my 98 Gt and now its time to start saving for a short block assembly or just a rotating assembly. I am looking at a budget of around $1500 for this so alittle help from you guys will be appreciated. Ok i plan on putting this baby on the bottle so I need a short block rotating assembly that will be capable of handling 500-550 flywheel horsepower safely. That is all that i will ever push on this car because I will kill myself with anymore power. So guys help me out here and point me in the right direction. I would prefer a short block but will settle for a rotating assembly. Thanks guys

the headswap isnt quite completed because a spark plug blew out of the motor and took the threads with it lol...but I have been considering going with a 5.4 mod motor but Im not real sure I just want something that i can pound on here and there and take some abuse.

I was just looking at Sean hyland motorsports and they have a "bigbore" rotating assembly for not to bad of a price and i was wondering do you see any gains from the big bore part? And can you still use your original block for that kit I know it needs to be bored ou quite abit but is it up to task?

for 500-550 fwhp could a set of rods and pistons do the trick? Or is the stock crank not good enough for that amount of horsepower?