I had one of the last of the Mk.1's, a 3000 GXL with the up-rated Granada engine and the better gearbox ratios. When I got it it was a year old (1974).
The suspension was poor so I did a lot of work on it.
I changed the struts for Bilstein and fitted heavier rate springs. On the rear I fitted harder radius arm bushes and adjustable dampers, plus RS2000 competition spring bushes.
The anti-roll bar bushes were changed for RS2000 competition ones and where the front anti-roll bar went through the track control arms I reduced the length of the steel bushes and used bigger thicker washers to squash up the rubber bushes a bit.
The steering rack mountings on the cross member were poor, so I welded on triangular plates to make the mountings strong & firm.
Then I changed the rubber steering coupling for a different type. From memory it was a Dolomite one which had the same splines.
From then on the Capri was fantastic and the road-holding and handling were transformed.
The aerodynamics on the Mk 1 were not ideal as at 125 mph the front would become a bit 'light' due to there being no form of air dam
.