getting a drippy fender reverb

What amp? Lots of other variables besides the tank.

 

As long as the input and output impedances are the same, it will work but I doubt you will get a difference.

 

The outboard reverb tanks were, as you probably know, run in front of the amp and added bits of distortion, drive and color as well as the reverberation itself that combined to produce the drip.

I've had some luck with replacing a tank that had too long a tail to shorten reverb but never tried, admittedly, to lengthen one.

It's easy to spend other people's money but the best luck I've had has been the Catalinbread Topanga pedal which has all the Fender outboard tank reverb controls PLUS a mix control that mimics the overall effect of the tank.

 

A short 2 spring does limit it. So my guess is yes it will give you more. I tried the short tanks in some Princeton Reverbs I had because I'm not a "big lush" reverb user. (still have the tank) But in the end, the longer full size tank sounded much better. Tanks are rated for duration etc:
https://www.amplifiedparts.com/tech-articles/spring-reverb-tanks-explained-and-compared

 

Like schmee, I'm a fan of the "long" tanks. I always change the short tanks out for a type "4". I've been using the "Mod" tanks for a while, and really like them.

 

I posted on the Canadian guitar site, too, but here goes:

Mark Bartel recommends:

"There is a tube swap that will give you a slightly brighter and splashier reverb - change the 12AT7 reverb driver tube to a long-plate 12AX7. The effect should be noticeable, though may not be as much as you are looking for. It's worth a try, though. If you try this, and still need more splashiness, then perhaps I can modify it for you."

Go to page 12 of this manual for your tube layout on the new Gen of Sky Kings: https://www.toneking.com/wp-content/uploads/2019/09/sky-king-manual_final.pdf