MuuMuu101's 68 Dart, A Learning Process...
Hey car looks awesome! I haven't been present of the fourms for a while. Looks like your having a few issues with carb and my first couple autox I did too. Im no expert but I would try and find a 750 dp, mechanical sec. Smaller carb might make less hp but on the autox course you can sacrifice some hp but better throttle response. Make sure you go through and tune the carb as best you can or have someone help you.
Second put some road race floats in your carb found herehttp://blp.com/cart/index.php?main_page=product_info&cPath=65_94_235&products_id=416&zenid=fd1901a54d1b1a0e686506d959701e88
Third I found that when I would race and slam on the brakes even with the floats, fuel would slosh forward and shoot out of the vent tube and flood carb and cause it to stall or die. Easy fix is to extend the tubes and connect with a rubber hose, then I drilled a couple of holes in the middle of the hose and pointed the holes up. I hope that makes sense, but this allows extra fuel to flow into the other bowl when you slam on the brakes. With these couple adjustments I haven't had an issue since then I have have ran my car hard at some autox and been great. Fuel injection definitely better but until then there you can make a carb work very well.
Also a oil temp gauge would help and make sure the oil dosent cool down too much in between runs. I have been at some events I make sure Im in the back of the line so I have time to get car warmed back up.