New cams on a B16 aren't going to do SHIT on an auto B16. They probably don't even make cams for an auto B16. Cams on B series VTEC motors are often used to make even more HP in even higher RPMS. You can't do that with an auto, so there isn't much point.
Where are you going to get an aftermarket torque converter for an auto B16?! I've only ever heard of like 2 or 3 guys ever swapping them. Pistons are pretty much a total waste too if you don't let your car breathe better with the basics. (intake, header, exhaust)
P&P - again... Not going to do shit unless you have a lot of other mods. B16s have very well designed heads (all hondas do) and there really isn't a lot to be benefited from cleaning them up with a P&P. Especially on a basically stock motor.. The more modified it is, the more gains will be realized, but on Honda motors (along with the chipped ECU) a port and polish should definatley be one of your last mods. All your modifcations need to work in unison.. You understand? Go with the basics first, there are reasons that everyone does the same mods in similar orders.. Check with NA guys on ClubSi and Honda-Tech..
Personally, my thing I would do if I HAD to go auto would be do all my mods for low RPM power. Actually, I'd probably only do an intake, exhaust, and a B18C, B18B, or B20 block. Get some torque and then your auto won't be such a turtle.
Why keep the auto though? Thats partailly why I bought the B16, IT COMES WITH A TRANNY.. So all you need is pedals and linkage and a shifter and other very minor things. 5 speed is SO much faster.. Seeing as how Hondas are small and don't make a lot of power their gearing is what makes them so much faster than other cars.. You need the short ratio trannys.. The 5,000rpm on the highway cruise.
Its nessisary to pick up speed..