Slant six turbo 500 hp cost analysis

now im not anywhere near 500hp yet but i built my setup to hold it in the future so i dont have to buy stuff twice. i also found some things much cheaper then you have listed.
distributor can be had in a junkyard for around $20, check it for play, if its good then you are good to go. you could probably get a lean burn distributor for the cost of shipping if you ask around.
650dp holley, $50 + $45 for a rebuild kit and $12 for the nytrophyle (sp) floats. the hangar mods are free they just take a little time.
ebay 31x11x3.5 bar & plate front mount intercooler $98 should be good 500+hp.
the exhaust header can be made from old headers. ive picked up a couple sets so far just to make one of these and im $20 into it so far add the ebay flanges and the turbo flange and it comes to just about $60
the offy 4bbl intake can be had for $100 if you shop around and are not in a hurry but go for $150 regularly.