I owned a 72 Custom Saloon that did not have Power Steering and yes you do struggle!! I also had a 73 Custom Estate which did so this could be the changover Year.
I am pretty sure you can add the Power Steering to yours but you would obviously need the donor parts from another vehicle.
I did see your Coupe on Ebay and did get an itchy finger to have a Bid. Its the only model out of the early range I have owned but not been able to use on the road as my one was a bit of a wreck to say the least.
Do you know the ClassicCrown website, Based in Oz but I am pretty sure you would be able to source all the parts you need to convert.
Anyone know if a complete MS112 can donate its P/S to MS65/MS75?
nb. I'm assuming that the facelifted MS65/MS75 (1973 on?) with the heavier chrome etc coincided with adding PAS. Like Peters Hunters car.
Altho I prefer the pre-facelift style of the '71/72's, the later ones likePeter's will be even rarer as presumably fewer were sold from 73 post Fuel-crisis. In fact one of my 72's wasnt registered until P reg ('75 ish) so it possibly even sat unsold til then since late 72??