Oh boy... I'm assuming you have a 93-95 5.0. First off if you are planning for close to 400hp, you might want to start looking around for a good tranny and clutch. If you want to add heads then you got to start thinking about roller rockers and maybe new valve covers and a spacer for the intake(depending on the covers you get). You will want to take a look at some new injectors, bigger maf, tb, tb spacer(unless you get a cobra intake), fuel pump, afpr, fasteners. Changing cam? You may want to start looking at new timing chains. You're going to tear down the shortblock to change pistons? You may as well start looking at rebuild kits. Don't forget you need gaskets. Other things to consider.. headers, h-pipe, water pump.. (it may start getting warm under there) radiator, fan... your rearend may start clunking, I'm fixing to have my rearend built now(parts ordered). I'm not trying to scare you but... one mod leads to another(trust me on this).
Blowers.. As long as you stay mild on the boost the stock pistons should be ok. I've heard of many people ordering a cobra sb and running 6-8#s of boost.
How much are you planning to spend?
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