Call Vutek they make a head reclaimer that attaches to Air compressor runs solvent through heads at 110-120 psi. A slight simple modification to the fittting to accept Spectra heads. Also you need to use Vutek California Head Conditioner this solvent it is very aggressive and really works great. Takes about 15-30 minutes to get 95% of your jets back.
Tell em you bought a used 3360 and want to reclaim the heads.
This machine works like a champ and reclaims jets perfectly.
Attached are photos of the unit