64 Barracuda slow going.

checkyour points setting if you changed to ecu yet then check your carb and timing , plug wires and filters or heres 2 options i have a 97-360 rollermotor for 1000.00 or ihave a 66 273 and 904still together , needs water pump buti:m sure i have that 2 , if you want to stay original love your choice in cars LIGHT EM UPPP