Hello I am new here and I am insearch of some vital infomation about my 93 F-150 4.9. I am comtemplating an engine change and I have a shot at an engine from a 91 F-150 4.9 with very low miles like 39000. I know it will fit as far as bolt in and all but what I need to know is the emissions devises compatable ?

What is the difference in the cylinder heads as far as the air tubes if any for starters ? Thanks in advance

 

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