Own a 1959 model 150 with O-320e2d and Sensenich 74x58 prop. Flown the plane with both o-200, then modified to del-air stc myself. I am also a&p. Over 3500 hours on the plane, owned it for 34 years.
If you plan on keeping your 150, forget what all the 'experts' on here say and take a look at...