How many O2 sensors for dual exhaust

[AcesArneson]

Setting up a 351 Cleveland with sequential EFI using 2003 Town Car EEC-V Coil on plugs.

Do I need at least 2 O2 sensors for dual exhaust with headers? Is it ok if they a wideband?

I am planning on a H pipe after the headers, any reason why I wouldn't do this?

[decipha]

Yes you need both narrowbands. A wideband can never go to the ecu o2 sensor wiring.

this is in the pre tune info and the hego write up
give them both a read over

[AcesArneson]

Thanks,

I am running CoP and just need to know which sensors go where and how they tie into the EEC-V. This engine is 351 Cleveland in a 73 Mustang so I am not using catalytic converters and have no EGR.
Using RZASA
Pin 60 is HEGO 11, it goes on the header for the passenger side narrowband
Pin 93 for the heater
Pin 87 is HEGO 21, it goes on the header for the drivers side narrowband
Pin 94 for the heater
Pin 65 is DPFE, since my manifold does not have EGR, I am assuming I can use this one for data logging the Wideband.
Does it matter which pin I use for the heater? Since I do not have aft O2 sensors can I use Pin 95 for HEGO 12?

Additionally, I have found information on the Crank Position Sensor for this build and just want to check with you to see if this is correct.
On EDIS-8 systems the VR sensor for the crank is placed 50 degrees after the missing tooth on a 36-1 reluctor wheel. Is an EEC-V with CoP ignition an EDIS-8 system?

[decipha]

no idea what your asking about the heater since you will not have rear o2 sensors
. pin 95 for hego 3 which you dont have?

yes ford uses edis for all cop

[AcesArneson]

So I don't need heaters on the upstream narrow band sensors? Pin 93 and 94 are listed on the pinout for heaters for the upstream sensors.

Do I need pin 95 for a heater on the Wideband sensor, or are heaters only for downstream O2 sensors?

[decipha]

yeah the narrowbands do

the wideband is completely independent of the ecu. The wideband gauge has its own heater.