Kostas,
The one thing that concerns me on your engine mounting is that the engine mount bolts look to be curved when the nuts were tightened down. That looks like it may be because of the angle of the bottom of the motor mount. That bend in the bolts puts some stress on the bolt and while you may never have a problem with the bolts breaking you might consider re-doing that a little bit. When I have run into this I have usually filed or ground down some of the engine mount level where the bolts pass through on the bottom of the mount to make sure the bolts get tightend straight without causing them to bend. In this case I guess you would say it's the top of the mount because your engine is mounted inverted. Just a suggestion

.
I would imagine your Cherokee is going to be a screamer with that Saito .80.
Dan