One thing that always bugs me about Grindhoused edits of films (and the offical Grindhouse film) is that the audio usually remains crystal clear in opposition with the degraded image, not quite following the "old and hissy" vibe it should have.

Have you considered incorporating stuff from other dinosaur movies, like Carnosaur? Something which does add to the feel of an exploitation film is to repeat footage, and spice things with stock shots of things that have nothing to do with anything ;)