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Big cabs, and tape wounds. Shake the earth, while rooting guitar and keyboard flightiness.

I think though, bass in most 70's psychedelia was just bass and an amp. Big amps!
delay, chorus, flanger, envelope filter
Drugs.
Seriously though, delay and phaser would my first port of call.
Most of the time, bass in psych rock at that time was really barebones (or am I thinking even further back, in the 60s?). Effects were rarely used, you could make the lines as busy as you wanted, but effects were mainly for guitar and keys.