If I remember right the plunger goes in first with the point pointing down, then the spring goes on top of that with the cap going on last. The boot coming from the air box is fairly stiff so it won’t crush like you think. That fits very tight so the clamp is just to secure it and keep dust from getting in. I’ve had this set up this way for a year now and it’s holding up fine and works great. It only cost a few dollars for the 2” hose and clamps. The hose I used is like the ones you use to patch to pipes together without removing everything. I can’t remember what you call it, it has a name but I can’t remember.
I have a 416 with 12 1/2 - 1 and stage two cam, porting and pipe with the air box lid removed and the header welds ground. The 450 carb I used worked great right off the bat but I did bump the main up to a 200. I sometimes run a 195 main but mostly a 200.
The pilot is stock I think but I suspect that the guy I got it from had put in the hr kit at one time and I don’t know what the jetting is on those. It did have a bigger main jet in it when I got it so that’s why I think it had the kit installed. I don’t know where the needle is ether
It run great so I never had to mess with it.