Did you cousin sell it to you because it wasn't running right, or what? I hate to say this, but from the looks of it he bought some of the crappiest junk out there and put it on the car with no concern to how it actually ran. Nearly all of the mods you've listed so far are literally the cheapest crap you can find. No way he spent $30k on mods.. looks more like about $3k, nearly all of which are downgrades from the stock parts.
What kind of budget do you have to get this thing fixed up? I would not drive it hard at all until you get everything fixed. Hopefully the engine isn't too messed up yet.