340 Build.
I use Racer Brown and Cam Motion for most of my cams. I do NOT use off the shelf cams for anything. There is also Bullet, which is the old Ultra Dyne stuff. I have used it, but I was never fond of it. Jones cams.
Just get a cam for exactly what you have. It aint hard to get in the twelves.
Unless you are me. I cant get a 340 into the 14's.