What should be my temp?

From my sons' 340 experience with a very similar setup in a '65 Cuda, the OP's 22" rad and whole cooling setup is marginal and the temps will climb. I'm gonna put in a different rad (as the Champion's 3 row design tends to be marginal), and we will work on more airflow through the whole engine compartment. With the small engine compartment and the higher temps generated with higher CR's, the heat takes more airflow in and out to control. The openings for the headers may help the OP.