340 cam change
you can check the cam with a degree wheel and a dial indicator in the car.
i'd say with just a dial indicator to suss out the lift you could likely ascertain the rest of the grind or close enough to make an educated guess.
have a closer look at them rockers they may be crane or isky. they all look very similar.
and yeah, i think there are many better options over the old 509/484 grind.