I have a restoration question for my 79 Z28. This is by no means a show car, but a daily driver and a father son project. We're wrapping up the interior and can't afford the high dollar sound deadening matt material but had an idea of using expanding foam in between the fender wells and inside panels. It's all dead space with no worries about covering up anything with the foam. I've used expanding foam in home construction so know the pros and cons, but it should work. Am I crazy?