How level does the engine need to be

And where do I take the measurement? I put some shims under the motor mounts and I'm not to sure if I like them... They helped for header clearance though... Just wondering what my options are... Also.... If I shim up the engine should I shim up the transmission too?

V-6 or 8 2 to 5 degrees should be fine. OEM's are 2 to as much as 7 degrees.I measure at the carb pad if it is level.Inline more and never 0 degrees as it will overly stress the crankshaft.

Are we talking level front to back or side to side?

Carb pad is usually where you'd measure it.

Of course the floor has to be level too, or you compensate.

the carb (intake flange) is what you want "reasonably" level then with that set (mtr mts/and maybe trans mt) see what you have for ujoint angles & adj pinion/maybe trans mt as needed

Ok cool thanks dudes j should be able to handle all that!

and, this should only matter on carb engines. once the fuel is vaporized through the intake runners, or shot at the intake valve on EFI, it won't matter. from tunnel rams with vertical runners, to slant sixes with horizontal runners...

Then, think about what happens when you drive up a steep grade or go rock crawling. I'd say how level the carb is, is not THAT critical, so long as it's level enough that fuel doesn't spill out the vents and the floats work properly.

Isn't the carb flange on most intakes at an angle inorder to compensate for the factory angle of the engine? If that applies here then he would want to carbflange to be level, if he tilts it back further then he may have noo much angle. But yes compensate the pinion angle for any angle change.

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Isn't the carb flange on most intakes at an angle inorder to compensate for the factory angle of the engine?

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Yes. So if you level the intake carb flange front to back and side to side, there should be about a 3* angle down, front to back, of the engine.