1/4 mile Shift Point

I have a stockish 383. It is a stock rebuilt 1968 2 barrel engine that has had the following added: Mopar purple Roadrunner Resto Cam, Edelbrock Torker Intake, 850 Holley Double Pumper, Edelbrock 75 cc RPM heads. The car is a 4 speed with 4.10 gears.

I have only had it to the track a few times and have shifted at 5000 RPM. Is this a bit too low?
Pay attention to your 60' times. With a 4 speed and only a few times at the track, you'll have to have consistent 60' times for the '200 rpm increase per run' test to be accurate.