I am happy with the power Keith Craft made with our 511ci FE. We don't have a Cobra, but a light 1960 Falcon. It runs low 9's with nitrous.
With the Pond aluminum block, Edelbrock aluminum heads and Edelbrock aluminum intake, it would make a fun engine for a Cobra.
I am sure Keith Craft could build one for a Cobra.
With nitrous ours makes 1,017 hp.
https://www.youtube.com/watch?v=NLP1i2gHwD4