Yes it will be above board if its one of his, if you bought it direct from him. If you have bought it second hand there could be no telling what someone's done to it.

Greens are fine, but if you want high impedance injectors the mods are very simple.

Traditionally there are certain advantages to low z injectors, however high z injectors are getting so good these days the advantages low z injectors held are no longer totally valid. Bosch EV14's are supposedly very good, as are the dekas.

Rob,