Sounds like it needs more timing
If timing is retarded it will put massive heat out the exhaust and is not good for the engine
I raced a small block Mopar for over 20 years--on gas , depending on head and chamber they usually like about 38 degrees Total timing with factory style iron heads--modern aluminum heads with better chamber design can use some less--also depends on flat tops or domes--domes require / like more
I have lots of Mopar parts and connections if you need anything