340 or 383 for 1968 Dart

My car is not a real 383 car. It was born a dart 270 with a slant. LH23B8B. I first put a 70 340 into it. Drove it about 7 years. Then it was 383 time cause I bought a thrashed 68 Coronet with 383/727 3.23 suregrip. Rebuilt everything and installed it into the dart. Drove it about 5 years then sold it in 1995. Got it back in 2025. Kim