I am 99% sure the 3FE only has 2 ports as well. A vapor canister is an extremely simple device so if it has 2 ports and a check valve with a can full of carbon is will fit the bill. I am going to tear into my old one just for fun and set it aside for a future use.
In the event a smog tech won't pass the visual, do not fret, just make an appointment with the BAR ref at Miramar College and let him know you cannot purchase the original anymore. If you are lucky, they will smog your truck there and it will only cost you 9 bucks. That's what it cost me to get my BAR sticker when I did the engine change on my 60. Otherwise he will will tell you what to do or pass you. The prof there is a nice guy, not out to screw anyone, just out to do his job per the rules, no more no less, and he will share his wisdom if he has any to share.
I only bring up the smog tech situation because I recall getting turned away from a Chevron smog test because I has swapped engines in my 60 years prior, even though I had a BAR sticker on my 60 and had passed smog multiple times, only to go down the street and get passed per the prescribed process. Some smog techs just crap their pants if something is different and refuse to apply brain to the problem. Others will make a call to the proper authorities, run the prescribed checks, and if your truck is legit, pass it per the laws guidelines.
Frank
