update, & resolved for now.
I agree the best solution is to weld the holes and re-drill, but this is not viable now.
I used the 12mm fine pitch thread bolts, with the nuts on the inside and a grade 8 lock washer under the head on the outside, I had to grind a bit off one nut's shoulder so it would fit next to the housing shaft.
I used an air impact driver to seat the nuts, as they had to driven into the sector shaft casting, the bolt head side lock washer will spread the load to a larger area of the frame. ( and the metric bolt head is large too )
not a "points" based solution, but it will keep the car pointed down the road.
next:
after testing, when the engine is back in I'll add some thread lock glue to keep them under full clamping power.
... how many metric threaded bolts on your A ?
thanks for the metric bolt suggestion!
regards
john.