[750hp]

I know of a pinky/purply coloured car that had a really old style V8 Supercar motor. It was so old that it had done a few seasons racing, then a few of corporate drive days and a season or two of Konica V8 before being rebuilt and pensioned off. It still had the Motec 2D system (back when you had to change settings with a screwdriver), and it might have made 420hp if lucky.

Current motors are making around 620 to 630hp, so any 700+ motor might only still have the intake manifold to resemble a race engine. More cubes, more compression, more camshaft, more revs, etc

Let me know what you find out. I've often thought a dry sumped 410 cube World of Outlaws Sprintcar motor with a little less cam and compression would be the ultimate Cobra motor.