Spec B's are the way to go for a bottom end untouched B18C7, if you were looking to raise the comp, then C's start being more the cam of choice. Every B series benefits from todays technology in head work, we will soon be offering some servicing options, from decent head services with full cnc valve seating, to adding deshrouded and cc'd chambers, then into cnc inlet and exhaust porting. The head will be coming off, so its something to consider when doing the work along with a thinner head gasket.
68mm is the biggest you would want to go on the t/b also, but a well tuned stock set-up will run into fueling issues, so a better pump and FPR should also be on the shopping list, the stock injectors at a higher pressure will be fine.
As has been suggested, a better header and cat combo would also be the go at this stage.
Biggest part of any cam change, is the install, cam timing and tuning of the car afterwards, best parts with bad install will not net the results you want and what others may have had out of the exact same combo.
Fell free to PM me for any pricing or questions you may have. ; )
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