The angle of the motor/tranny is the natural angle set when the top of the motor is level (0 deg). I checked my el camino last night - it came stock with a small block. The top of the intake is parallel with the ground (0 deg). This position allows the oil to flow to the pickup point in the pan and keeps the carb level - as it should be (or so I would assume - or it wouldn't be that way stock!).
I understand about preloading - I had to account for the amount of weight that the cab and body panels added when installing my motor as well.
Don't forget, you can still adjust the motor slightly (very slightly) once it's bolted down. The motor mounts provide a small amount of flex - so to speak.
I can measure tonight off of the valve covers on the el camino.. do you need me to do that? You can also call you FLAPS and they should be able to tell you the same thing.
- Ryan
