After spending several hours I finally found somewhere that could balance the Marcos alloys on the stud holes. The bad news is that the alloys are in bad condition as it took a lot of weight to get them to balance. The ideal solution would to buy a set of new wheels but the car just wouldn’t look as good.
There is still a bit of noise coming from the rear of the car so I could have a wheel bearing on the way out but its not that bad yet so I’ve decided it ignore it for now and try and get some use of the car while the weather is good.
The photo below shows the car completed with the exception of the interior. At least you can drive it and I will have to do till the seats are re-trimmed in August (just in time for Prescott).