What's this bike worth?
Here's what the owner says about it ..."Well...tell ya what. I got it out of the shed and it looks a little more worse for wear than I remember. I would be willing to drop the price to an even $1000. It is a CB350Four, 4 carbs, 4 pipes, 9135 miles. It is pretty much complete. I have the battery cover and rear signal lights at the farm which I will get. There aint too many of these old girls around anymore so I wouldn't want you to miss out."
Also, is this too small for a big galoot like me (6" 3" 225lbs.)?
If it's a 1975 it'd be priceless

, since I'm pretty sure they were only made for 72-74 (3 years). But maybe that was only in the US and they sold them in other markets for longer? So, you'll want to clarify for sure what year it is.
As far as too small, your weight will be OK as long as you don't want to pull 70 mph on the expressway. I weigh 230 and mine was WOT and struggling on expressway. But for backroads and 55-60mph she's a sweetheart. 6'3" might be a problem, I'm only 5'10" and she feels OK, but a little small, especially when I first get on her off one of my other bikes. The small feeling goes away after a couple minutes and I fit right in but 6'3" might be a different story.
They're really fun little bikes if you respect what they are. If you want to ride it hard like a modern bike and expect it to perform you'll be disappointed. If you want to be entertained by how frickin' cool it is to ride a 40 year old set of four
Honda 90 cylinders in a row, you'll LOVE it! I love mine.
In my opinion 1k sounds like a lot. She'll need new exhaust for sure (probably have to gin up your own, nothing aftermarket available except OEM replicas for $1200!). Also will need two tires and tubes (200ish), and probably a bunch of other little stuff that'll add up to 3-500 easy. So, if she's pretty much all there and in decent shape, with just some money and TLC to be thrown at her, offer him $700 or so. More than that and it's a love story between you and the bike, meaning you're doing it because you want the bike, not because it makes sense.