Your problem is the O2 sensors have to have the cats there in order to read your exhaust correctly. Without the cats on a modular motor car such as your 4.6L you will have to buy what are called MIL eliminators. These plug inline with your O2 sensors and keep the Check engine light from coming on (basically tricks the computer). When that CEL comes on it triggers the computer into somewhat of a "safe" mode (like pulling some timing out) so you will lose power with that light on. Some places like Dallas Mustang sell the MIL eliminators and they are very easy to install. Go to the Modular Madness forum on this board and do a search for the MIL eliminator and you'll find all you need to know including where to get them.
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1967 Mustang Coupe
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