Re: Three questions...all related to the REAR END
1. For a pure drag car, it's fairly common to set the pinion angle based on hp. The more hp, the more down the pinion compared to the trans output since the rear will climb in a leaf spring car under acceleration. Five degrees is fairly extreme but not unheard of. For a mainly street car, setting it up closer to equal but opposite of trans (+4 to +5 degrees in your case) is usual practice in order to control driveline vibrations and component wear. You would correct your angle if desired by either shimming the pinion up with angle shims in the leaf perches, shimming the trans up with shims under the trans mount, or a combination of both. Not clear on what you mean by the "DSE collars being welded to the tubes."
2. Yes, those sound like Moser axles. The 53 may be for the end-to-end length which is about what a first gen Camaro is.
3. I doubt that you have C-clip eliminators as Ford 9" rears use bolt in axles standard, although I guess it's possible someone could've cut the ends off and replaced them with eliminators. C-clip eliminators are a bolt on deal with a gasket that convert a rear to bolt in axles. Your Ford rear should have welded on bearing housings. No worries if that's the case.
Sounds like the rear has a locker in it. As far as the wheel hop, pinion angle shouldn't have any effect on that. I'm not an expert an that for sure but have heard of lockers causing hop by cycling loaded/unloaded or bad backlash setup. Your rear suspension setup does not sound like one you'd want to run with a locker, I would think you'd want softer springs and shocks for track use.
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled