Although it's a 340 with an aluminum intake, I blocked off my crossovers due to the experts advice and I had to disconnect my choke and wire it open for it to run on start up. With this done, it'll start and I have to foot feed it to keep it running until it gets warm but I can drive it pretty much right away I just have to control the idle. At some point I am gonna go back and replace the intake gasket to open the ports back up, the problem I was chasing wasn't cured by blocking the crossovers and my choke worked perfectly before that move.