The tweeter caps are already film [the one's bundled together] the rest are all 'lytics.

Having been there & done it with a pair of 44 [near identical crossover] I would advise replacing the tweeter capacitors with decent modern polypropylene's & replacing the rest with Alcap low loss 'lytics from Falcon acoustics. In other words: get them back to "as intended" by Celestion first and then see how you feel about mods.