I have a 302 out of a '93LX Thunderbird that is sitting in my '73 F100. I plan to use long tube headers but I am unsure if they will be compatible with O2 sensors. I have no qualms about having bungs welded to the headers but do they need to be the same distance from the exhaust ports as the original manifolds? If so, then it would place them somewhere on the individual exhaust runners before the collector. That won't work, will it?