Oil pressure

'68 HP383 barracuda 4 sp. Oil pressure runs about 75 cold idle- when driving well warmed up it's about 55 at 45mph, maybe 60-65 at 55 mph, dropping to 25-30 at hot idle. 10W40. Just a mild cam and high volume oil pump, pretty much stock everything - do those pressures seems about right? Seems like I had a little higher oil pressure last year but could be wrong. Under a thousand on the oil but it's been in 2 summers so getting ready to change.