If I put a Warmoth neck on my guitar which has normally has a contoured heel neck, would it work?
The contoured heel is part of the body, not the neck, Warmoth does it with their bodies with no neck mods.
^And besides that, you haven't even mentioned which guitar you've got. If it doesn't fit your guitar's neck pocket you're screwed, contouring or not....
It's ok, I already figured it out in the customizing forum.