manhours for front suspension rebuild?

It's a bit hard to estimate not knowing your degree of skill and supply of tools and equipment. A front end shop would only need 4 hours to do the whole job as a simple repair (they'll probably charge you for eight) but they're used to doing it on a daily basis. Most of us would want to do a restoration while we're at it. That will take a LOT more time to clean, blast, prime, paint, etc. I would recommend you get a complete spare set of parts and restore them at your leasure and then once they're all ready, do the swap. If you plan on owning the car for a long time, it's always good to have some spare parts on hand for future repairs. A simple R&R of the parts should only take a few hours even for a novice.