So you have a complete '73+ suspension on there. Shouldn't be any issues that I know of.
The travel shouldn't be affected by the shock unless it is too long or too short and then you will damage the shock or rip the mounts out. Suspension travel should be limited by the upper and lower bump stops.
Are you missing the upper bump stop under the UCA? That would let the suspension droop further than design and might put the tie rods or BJ's in a bind.
