I have 1600 miles on a professionally rebuilt set of original Houdaille shocks. All four leak and often need replenishing of their fluid!
The Houdaille shock absorber has a poor seal design, and once they start leaking, the Houdaille shocks become non-functional decorations. If you use your Model "A" mostly for driving / touring, I suggest using one of the telescoping type shock kits available from dealers.
I do not have any first hand experience with Stipe's reproduction of Houdaille shocks, so maybe his shocks perform better than the originals, and do not leak.