Is my 340 stroked

The degreeing the cam thing is important. I mention it not to beat you up, but because a good number of guys don’t and the problem is exactly what you are facing. Put it together and something is off. You can only guess at this point. If it’s off, you’re pulling the front of the motor off. I will do it every time. I leave cams to the smart people, but that carb is pretty user friendly. You need to find out where it is going fat, then it will point to why. Borrowing or buying an AFR gauge will help. You can buy a $20 two wire Chevy truck 02 sensor and connect a digital volt meter. You can find conversion table online for afr to volts. Accurate? Not really, shows when it goes pig fat? Yep. I run an 800 thunder avs. Becareful with the air door spring. Don’t over tighten them. They break.