I've got an 87 302 motor in my 66 with a holley 650 carb that's got it's stock jets in it. When I'm in 3rd gear and at around 3500 rpms, the car will start to die and stall unless I get off the gas. The car has been getting real hot, and I over heated 2 times. I have a new thermostat to put in, but I'm not sure that's the issue. Also, when I get on the gas from a stand still, I can't spin the wheels. However, I can spin them when it switches into 2nd and even 3rd sometimes. Any advice would be great. Thanks!