No vacuum secondary carb. Most guys err on the small side and don't buy a cam for the TR. If that cam wasn't ground specifically for the TR I'd sell it and get one that is. And a minimum of two 750's. A very, VERY smart guy who worked for a very cool company once told me to really get the correct carb on a TR you double what you'd be using on a single 4. And he told me that in 1982. It still stands today.