Stock internal 318 redline??

I've got a 74' Duster with the original 318 that's had the top end replaced with mostly eddy performance parts, (alum. 4 bar intake w/600 cfm carb) along with hedman shorty headers and most importantly, an aftermarket cam *unknown lift/duration, I assume similar specs to a 340/360 cam* Other than that it's completely stock from the heads down. Car has 3.55 gears if that makes a difference-

Anyone know where the redline would be?

-Car likes to naturally shift at 4700 from 2nd into 3rd with the kickdown properly adjusted, but it feels like the powerband can go a ways further still.
Depends of valve springs when valve floats starts, as for the rpm the engine turns before harm Fairly high but not much need to spin past 5500 rpm or so.