I'm not against prying on the case at all to get the surfaces to move, but against those small 6mm studs is just asking for trouble. The positioning in the fan support is great, and pushing against the inner surfaces of the PCV opening are good as well. I can tell you first hand what it costs to TIG repair the snapped studs/broken case as I do them often enough here for people who pry or drop the cases
Also, for those looking for something to strip the sealants off. I use Kleen Strip aircraft paint stripper in 100% concentrate all over the housings prior to putting them in my jet wash machine. The paint stripper is the nuts for cutting through oil/grease, carbon, most sealants, etc, etc and washes off with warm water(even a pressure washer can do the trick. It's now offered in aeresol spray cans now making application in the tight areas of the case and relative housings much easier. Very stubborn sealants I just take a small brass bristle brush to put a light scratch in the surface of the residue and it allows the paint stripper to penetrate the material and lift it.
I used to use industrial type aluminum acids at the shop but the paint stripper works faster/better and is actually cheaper in the long run because I'm not dealaing with hazmat charges anymore
EDIT....also for the "newer" cars with the engines that have that damn german undercoating crap on them(IE 986, 996, etc) the paint stripper eats that crap right off like nobody's business!