I agree, there are a lot of rusty & cracked boat motors out there. They came is forklifts too. A good one of those would serve you well but if you are happy with your 153 go for it. Parts are plentiful. They are easy to work on and truthfully have plenty of power for any kind of 4x4 Jeep use short of all out show off crazy u-tube stuff. You can rebuild both of your 153s for what a 181 would cost.
