if you are going to buy an intake manifold anyway then the choice is up to you on the head. you can look into honing out the intake manifold so you can put a bigger thottle body on but you dont need nothing that big. hell i think alot of people or using 70mm for there turbo set ups. but i think that is just right for it. if you are going to use it as a daily still then buying a bunch of aftermarket stuff isnt the way to go. i would just get a nice head. nice intake manifold. 310 cc injectors and call it a day. you can hook it all up and have fun. if you want more out of it then pick up some itr or ctr cams and slap them in and you will feel a difference. dont think to hard about it because you will notice a good difference betweeen the two setups.