360 or 440 for my 1970 dart daily driver

How is your suspension? I would want that and my brakes to up to par first before going to bigger power. Im 33 and was a passenger in a car that was rolled when i was 16, we all walked away with no scratches but the car was totaled. I just got done upgrading my whole suspension, chassis and brakes on my 67 dart as a primer before i upgrade my drivetrain to more power. With whatever decision you make, think about the whole car and how it interacts together. Whats your budget on things?