lqdsnddist
Axe-Master
Dick Dale did a Q&A after a show and I asked him how he sets up his reverb, and the King Of Surf Guitar said the only thing that was important is to put the reverb (he used a dedicated tube reverb unit) before the amp to get that surf-y goodness!!
If one was using an external Fender tank style reverb, and an amp without a loop, the only possible place you could put it would be in front. You can get a pretty authentic surf tone though from amps with the spring verb after the pre-amp though as well, so I've never noticed a huge difference, owning both an external tank, and plenty of amps with built in spring verbs. Some built in spring reverbs though had smaller physical springs so that did sound a little different. At least with cleaner tones doesn't matter where its in the chain, still gives a nice spring "sproing" sound when you mute the strings