This is the cam I’m running in the wife’s car. Though not a Magnum build, it is a .030-360/zero slug deck w/Pro Maxx CNC ported heads. Backed by a 904 & 3.55 on 26” tires and custom 2400 stall Pro Torque converter.
It is an excellent street performer that drives easy and runs really well for a small cam engine. I think your on track duration wise according to your description above.
(Though, IMO, your way small on the carb size & your tire is a bit large @ 28”.)
THANK YOU! Nice cam.