Oregon Cam #346 - questions

@RustyRatRod valve info is in my original post :)
1.7 & 1.4 from a Ford 260/289 with smaller stems. The runner into the port will be gasket matched but only in the direction of airflow. Both will be smoothed, but not highly finished to yield a high air velocity while keeping things in suspense. Intake seat will be radius back, and the ball will get a hog cut, a basic street port. Hoping to fit a set of canonical or beehive springs. The 346 calls for 300 foot pounds, but if I go with either tapered setup, I can probably come in around 280. Just a little extra info to exercise your noggin. Thank you so much for your input!