All good info, also be careful not to get caught up in the horse power numbers. A 500 hp streeter is a lot of hp and as said costs a LOT of money for the engine and drive train. You are very wise to plan your engine build ahead of time, a lot of guy's don't do that and they end up with a bunch of parts that just won't work together.
The best advice I can give you is to build the best STREETABLE engine suited for your application with the budget you have....and be happy with whatever horse power level you achieve. Of course you won't know that until it's dyno'd, there's another $500 or so. I'm sorry, I don't know the exact web site name but it's something like "Ryan's car page" you might google it, LOTS of builds on there with the dyno results....worth a look and enjoy the fun and satisfaction of building your own engine.