If you're taking the plate out you may need to check where everything lands as far as moving the cylinder down after removing a plate. Definitely call around to a few folks for domes. Noss is quick and has done many set ups even for other builders. That fella has cut something for just about any set up.
When you call, know your deck height, piston type, desired fuel, rough elevation, and type of RPM's your machine is geared for.