There is no advantage to changing from the "65" style to the "66" style. The person who recommended the change is now someone you should not take advice from.
For a typical street performance car, the 65' mounts will be just fine. I prefer them as they tend to lower the motor 1/2-1" compared to the 66' and later mounts.
It's not supposed to. Clearance on the lower hose and shroud is about 1/2" with either mount system.
In a serious performance situation (again drag strip related including hard launches with slicks) the single attaching stud 65' mounts are at a disadvantage. I replace the driver's side yearly as engine torque pulls the center mounted stud and results in a distorted mount making the LH side higher in the engine bay. The problem would be lessened with the 66 bolt-through dual mounting location which is better supported.
Either is a rubber sandwich type, not suited to drag racing. Now, the good ole' boys take a new mount and put a bolt through it, making it indestructible. Then you don't need new ones all the time.
OK, then here's a trick you need for your car- Use the "66" frame brackets, and 73 motor mounts.
1973 was the year the feds started requiring loop-through mounts. The intent was the mounts won't fail even in severe impacts.
You can get them in rubber or urethane.
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