It can be a problem, I guess it would depend on how quick youíre going to launch.
Most of the quicker street cars here only get low 1.6-60í @ low 11ís. Iíve asked the question to a few guys and there are no reports of low oil pressure. Iím not real sure what would happen on a decent, wheels up launch. I run a well baffled 7 litre sump on my car just in case.
The gasket and windage tray looks to be the same as it has the cut out for your dipstick location. There is also a plug available from Holden which seals up the dipstick, but itís a standard size welsh plug so you shouldnít have a problem getting one.
The dipstick part number: 9206 5825 the tube: 1256 1544.