I finished the 3x2 to 4x2 conversion. Linkage works great. Center two Stromberg 81s are the pirmaries and the two outside Stromberg 97s are the secondaries.. I will be taking the intake to a friends and bolt it on a 300 ci flathead.. My guess is it will run great. I might have to rejet the 97s smaller, won't find out until we fire it up.. The was a fun project. I like building the linkage.. Linkage in mock-up and intake completed.. Duane.