Have to go along with Mike and Richard. Used 97's on flatheads and CSB and had nothing but trouble with them. The cfm on the 97's were only 155 and I use to take the tops of the stromberg 48's to give me more cfm as they flowed better. I always had leaking problems and if you do use them as you say they are fairly easy to rebuild. Be sure to replace the thin gaskets with modern hightech gaskets from any auto shop. I use rochester 2G on my tri power set ups and they work much better than the 97's although they are not much cheaper. Alot of cores out there for both carbs but be sure the 97's haven't been beaten to death by someone trying to "adjust" the float valve.