find a slicktop. It's lighter, and thus a little faster, and it'll be worth something (even if it's falling apart when you're done with it) down the road. You won't have to worry about leaking t-tops from a neglected Z, and modding it more later won't be completely pointless. There are actually a few in semi-decent shape in your area that I've found, so check autotrader and craigslist.