Two questions. . .

This topic is already active HERE.

The motor mount attaches to an L shaped bracket that has a stud in it. The stud goes into a bracket with one nut to hold it in place. You can place washers to use as shims to raise the motor up to allow the fan to clear the shroud.
I had a creep problem, the motor would creep over to the passenger side, it was sliding on the 4 washers I needed to raise the motor. Got tired of adjusting every couple of weeks and got the '66 motor mounts, uses a different mounting system and the mounts are stronger. The good news, they use the same mounting holes as the '65.
If you got a locking nut on there just make sure it's tight, if you start some engine mods to up HP, think about swapping out. MikeR

Not sure what is going on with your water pump. The 65' style hugs the block pretty well and will give you maybe 1" fan to radiator clearance with a stock fan. I use the 65' pump and pulleys on my 351w and had no clearance issues using the stock 4 blade fan. Currently I am using a 4 row radiator and a 3" total length clutch fan and still maintain 3/4" clearance. See the other post referenced above to get the proper combo pump/radiator/pulley/timing marks, and balancer.

I suggest you measure your fan spacer and purchase a slightly shorter one if you don't want to tackle the above referenced changes. Try to maintain 3/4-1" clearance but don't get much further away or cooling will suffer. Most autoparts stores, such as Advance, sell them in various lengths (or check the local boneyard.) Also plan on a hardware store run to purchase shorter length, fine thread bolts.

The 65' mounts with locking nuts should work just fine.

If you want to beef up the 65' rubber mounts, it is easily done. I used this method with my stroker: http://www.erareplicas.com/fiaman/engine/mountmod.htm
I won't even need a torque strap now.

As a side note, the 65' type mounts are great for hood clearances as they tend to drop the engine approximately 1" lower than the 66' and newer mounts. The only real issue is that header clearances are usually improved with a raised engine.