ERA has a good drawing and photo of this on their website for their manual suppliment. I used this on my 1959 Ford pickup and on a 57 Thunderbird with dual carbs. Worked well. Used 1/4" heim joints and covered with 5/16" brake line like the text suggested. Worked great.
Check out
www.erareplicas.com/427man/engine/linkage.htm
Jim