I would have to see a picture so I’ll check one out on line tomorrow. Otherwise the best fitting header is ether Doug’s or TTI
Port wise, the Magnum is square and most of the other LA heads are the same but not always exactly. The miss match is not to be concerned with.
If your doing 3 inches.......
It’ll be fine for the intended use.
While more would help I don’t think you’ll feel much of a difference.
No. Regular engine mounts will be fine vibration wise. Schumacher creative Services has an engine torque strap. I’ll picture it in the next post. Simple and effective no vibration.