Just a few thoughts for you. I'm nobody's idea of a guru but I've built a couple of slants - I will happily defer to those with greater knowledge and experience. That said, you mentioned the lifters came out of their bores. That means it is possible the intake and exhaust lifters went back in the wrong holes. If so, this is a bad deal. At a minimum I would recommend getting the lifters resurfaced at Oregon Cam Grinders. Better that than to get the wrong lifter on the wrong lobe for a cam with lots of miles on it. The pushrods should be no issue to re-use in whatever hole.

Second thought, you list two cams you are considering from Summit. The first one listed is a solid lifter cam, the second is a hydraulic lifter cam. I don't have FB so looking at your videos is a bit of a struggle, but looking at what I can see of your rockers, it sure looks like you have a solid cam. IIRC, swapping from a solid to a juice cam has side issues with how they oil the valve train. I suggest getting better advice than I can offer to figure this out to make sure you don't put the wrong cam in.

Last thought, I wouldn't put a Comp cam in anything. Their quality has slid badly in the last few years. If it was mine, I'd send the original cam in to OCG also, and get it reground along with the lifters. If you're just looking for some more spunk out of the car, their 2106 is a good candidate for a relatively stock build.

OK, I lied. This is really my last thought. Swapping a slant cam without pulling the engine is a tough call. I've not tried it but it's probably less of a good idea than pulling the engine. Besides, it would be easier to degree in the new cam when it's on a stand.