Congrats, nicely done!
If one woofer must be reconed, then I would do the other one as well since new GPA cones are probably different enough from those made 50 yrs ago, for there to be a mismatch in the frequency response (not saying that the older cones are necessarily better - just different). Better yet, in order to preserve the good 416, try to find a single defective 416 on epay and have that one along with your existing driver reconed and remaged by GPA.
I would stay with 16 Ohm drivers for two reasons: a) they're a better/easier load for SET amps. b) capacitor values are halved over those for the 8 Ohm version of the cross-over, which means that you'll either save money, or get better quality caps for the same amount. Capacitors are usually the most expensive components in a crossover. Speaking of crossovers, you must at some point try the Jean Hiraga crossover for the A5. A good write-up on the A7 is the one linked bellow by Pete Riggle. His A7's use the same components as your speakers. You could duplicate his crossovers using russian caps such as MBGO's and KBG-MN's for not that much money.
Good luck and keep us posted.
Altec A7 Voice Of Theatre Speakers
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