+1! Nice scratch-build of one of the more elusive scratch-building subjects. Realistic scale headers are not the easiest to pull off, and you have done it NICELY!
Beautiful dark blue, really suits this body style. I've built both the hardtop and convertible version and found it to be an easy kit to build. Well done!
You may have the lowrider version, which contains a 396. The bone stock convertible has the 409. Here's a sprue shot and some cool informative reading:
A lot of folks were surprised at R/M's choice to put the 409 in the kit because it was so unusual. Many (including me) would have been happier with an equally detailed 327 for a change. Heck, not EVERY car needs to be a big block!
Try freezing it; give the joint a dip in water, put it in a zip-lock and toss it in the freezer over night, and it may separate easily. Trick works sometimes, sometimes not, depends really on just how well it's glued.
Exactly my reason for using primer, I enjoy modifying and custom work, so a variety of fillers and their unique properties necessitate something to provide a uniform surface for the topcoats. It's all about intent and purpose.