The fact that you take your dog to a dog park tells me you do not want to listen to the advice of the experienced. So why bother asking. Obviously you will ignore what you don't want to hear.
the question is not if they are going to fight it is when are they going to fight? ALLWAYS EXPECT A BULLDOG TO FIGHT. having two DA dogs in one home can be done but it takes a lot of hard work. as far as your dog not even grownling at another dog some bulldogs take a few years before they turn hot. so don't let that be a huge factor in the choice you make.