It must close straight, try to fix it.
The numbers are realy good, try to save them.
On exhaust, all Novas based engines ( not only them) have arc on the top line. It is some their theory, but I use staright line theory. Don't overcut that line, too much of exhaust will cut your torq on bottom end ( dwell time will be too short).
have fun and if you have more questions, please ask