Re: Head gasket help
If you have the choice, it is always better to use inch pounds since your accuracy is better. (your accuracy, not the wrench accuracy. If you tend to go over a little when the wrench clicks, it is not so extreme as with a foot pound wrench.)
If you have a pointer style wrench just be careful to read it accurately.
18.75 is kind-of on the low end of a foot pound wrench, but if that is all you have, that's what you will use.