what do you guys think about this cam rec

That's a heck of a lot of lift for stock 340 heads. Most stock heads I've seen won't handle over 475 lift. You usually have to have the valve guides cut down so the retainer doesn't hit it and for dual valve spring clearance which I'd bet that cam calls for. Other than that it should work good once you hit the sweet spot which will probably be about 3000-3300 rpm. IMO it's a little big for a 2500 stall converter in a 3400 lb car.

Just noticed that according to your spec sheet you want to shift it at 4750 rpm. If that's the case it's way too much cam. In a 340 I bet it'd easily spin 6000. rpm