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Jet Power Moduels
Summit Racing, and possibly some other stores, carry a $200 (US) Jet Power Module for the LHS 3.3/3.5 Mopars. This unit is not adjustable, and basically advances timing and changes shift points for more performance.
This is made for the mid 90's LHS 3.x models, and to get it to work in an older, AC/AY, you'd need to get an A606's computer/electronics to work in an A604, and then would need to swap the LHS computer system into the AC/AY body.
Realisticly, I hear 10-20 hp as being common gains from Jet Modules. Others despute that. But, assuming that is true, you're paying $10-20 per HP! Not gonna be your best HP per buck mod, especially once the electronic mods are taken into consideration (though expect at least 10 more HP just from that, as the newer electronic systems with knock detectors also increased the HP of the 3.x by allowing for better tuning of the engine).
Similar electronic add ons of note would be a Superchips ICON 4000 which basically allows you to program your ignition timing so that it changes based on the engine's RPMs. This little, but effective add on is ~$400 (US), but definately worth every dollar when you gain soo much control over your ignition system. Wiring it to work with the 3.3's coil pack would be a pain, but it's possible.
MSD makes several ignition timing controllers, though most (if not all) are designed for use with MSD ignition controllers. Some of these controllers (which typically sell for under $200 US) may be made to work on non-MSD ignition systems, or a complete change to an MSD ignition system could be used (though then you'd have to get the PCM to operate without controlling the ignition!). Either way, such changes would require $$ but would bring about extra power and torque across the entire RPM range. However for the price, your best bet may be to stick with fine tuning the octane level, fuel amount, airflow and intake temperature before considering timing changes as a way to end any present engine knock. It's amazing how much can be done to increase performance without touching the timing.
Now if you want to control your 3.3 timing, you have to adjust 3 different timing signals (one per pair of cylinders). This would require 3 timing controllers OR swaping in a PCM with the knock sensor and manually feeding it the knock sensor output. Basically the knock sensor puts out a varriable amount of voltage, based on engine ping/knock. So say if almost no ping is 1 volt, you give the PCM 1 volt and it advances timing thinking things are good and ping free. If you want to retard timing (like for boost, etc), you give it more voltage, like 4 volts. Now if you really wanted to have a cool setup, have something setup so that you have a 3 bar map added and for every set amount of boost, it retards the timing a proportional amount.... pretty cool, no? And Chrylser says you can't control 3.3 timing. Ha!
'course the 3.3 knock sensor only sends voltage when the knock occurs- thus you'd need a 555 IC to make it a short lasting blast of voltage.... but again, just a matter of sitting down and troubleshooting out a basic circuit.