More than I'd give for it, personally. That's one of the oldest bass heads Peavey made. But if it looks good and sounds good, with a cab... for $100, sure try it out.
See if the cab is 8 ohms or 4....IIRC the head was rated 200 watts into 2 ohms, 140 into 4 ohms and around 100 or less into 8 ohms. The cab is likely not a Black Widow, if it was that would make the cab more desirable.