Thinking your '37 is similar to my '40, fenders are bolted to rad shell, inner fender / splash panel which is bolted to frame, cab corner, and running boards. Not that tough to pull the fenders and may save you a ton of regret if you damage them. Speaking from experience, trying to lean over those fat fenders to do any engine work is a back breaker ! Pull them off and you can slide in around the wheel area real nice.
