You will have problems front and rear with just about any after market wide 5 wheel on a lowered early type3. except 63 model maybe.
Your standard wheel offset is +46
Original BRMs are +12 Flat4 +15
With these and the standard set up in the rear they will hit the guards with a 165 tyre and in the front not much turning before they hit the guards even with a 135 tyre on a lowered car.
The wheels you said you are looking at seem to have more offset. Maybe +20 Maybe a little more.
I think you need an offset of +35 - +40 to bolt wheels on a moderately lowered standard car and have no rubbing issues.
2 splines is a lot 110mm to 120mm lower than standard.
most type3s you see that low with after market wide5 wheels will have short axles in the rear and a narrowed type1 front end.
See this thread
http://forums.aussieveedubbers.com/viewtopic.php?tid=84488&page=1