Probably shift around 6300 or so peak power in the upper 5000s. That cam is probably a little bit small for that engine.
The easiest way to figure shift point is to put it on a dyno and do the math.
This is good advice. I have a similar cam in my 347 and I shift around 6500.
347, 205 11R's, Box R Intake, Ported lower, custom comp cam, 42lb injectors, 255LPH, pro-m 80, 75mm Cheap-ass TB, 1 3/4 x 3in LT's, exhaust by me, A5 trans, 4.10
422WHP/456Ft/lb. Tuned using QH by Tony @ Tuners Inc.