I have a 67 mustang with a 289, c4 trans, and edelbrock 4 barrel carb. After driving car for as little as 15-20 minutes on a hot day it heats up to the h and I either turn it off or it will idle bad then die. It has an oversized radiator full to the top and I just changed the oil. I’m wondering if it has to do with vapor lock or a vacuum or something? Also it tends to not start or crank really slow after shorts drives. This is my only car and I need it reliable for daily driving, anything helps.