Could use a lot more camshaft
Performer RPM cam (even the flat tappet) is far from a stock cam:
- Duration @ .050: 238°/246°
- Advertised Duration: 300°/308°
- Stock 383 roadrunner 4bbl was .450/.468 lift with 268/284 duration The duration at .050 lift is 214/225
But still pretty mild by todays standard