Valve timing
 

I'm changing the head gaskets on my sisters camry, its a 3000 V6, the cams on the front of the engine had paint marked on the marks for TDC, the back side wasn't marked and I'm a fool for not marking it.
There are two timing marks on each cam, the manual says to install the intake cam with the single mark at 90 degress towards the exhaust cam.
My question is which of the 2 marks on the exhaust cam do I align to install the exhaust cam.

Thanks for any help.

Foolish Mechanic

RE: Valve timing
 

there should be 2pairs of timing marks if Im correct. each cam should have a single dot on the cam gear, 180 deg from the single dot should be 2 dots...align the cam on the 2 dots....... when you rotate the cam 180 deg the single dot should line up....i hope you have a bolt to lock the sizor gear during diassemblely..good luck