I am at a stuck point with my 383. It has not been on the road yet because it overheats. It was running 230-240 at idle and this was in the winter. I messed with the timing and now it is running 200, but still wants to spit out the overflow tube. Also I took it out around the block and it wants to die. Also noticed while driving the motor sounds like it surges. It will run and then go down in RPM then go back up. I got an aftermarket balancer so it is hard to figure out what the timing is, but it appears to be around 9 degrees. It is a new engine with everything new, new radiator, fan shroud, new eddy 625 carb. If the timinig isn't the issue where do I go next? Any help will be appreciated.