the stock block can hold up to about 19psi. you will stop seeing significant HP gains after about 14psi.
internal wastegate sucks. get him to convert to an external wastegate.
make sure that the BOV is a recirculating BOV
if he is placing the MAS between the filter and the turbo.
yes, he needs fuel upgrades. a 255lph Walboro fuel pump(its made for the 2G eclipse, but it will fit the 3G). he will also need bigger injectors. getting a 1:1 rising rate fuel pressure regulator(boost referenced) will help out with the tuning. you can get instructions on installing the fuel pump(trust me, you will need them) from here
http://www.tearstone.com/shop/index....&id=2&Itemid=6
what is he using to tune it?
is he using a 2G turbo manifold? make sure he knows that he needs an adapter plate to make the 16g work with the 2G manifold(if thats what he has). he can get it from RRE.
i have no idea about the oil lines.