I believe the hull you have is an Enforcer crackerbox which is a shallow v hull.The giveaway is the cross member that divides the engine compartment from the radiobox section The rear opening should have a hatch cover that two drivers sit on.You could get the 50mph ,but not with that weedeater engine, even with modifications. A Zenoah 260 should get you near that 50mph. The crackerbox is a wild handling hull that like a full deep vee,and requires learning to drive it,but when you do it is a blast.