it cant screw directly into the block, its rather fat, and would obstruct the oil filter. you can get the extension from ford, but it is rather expensive ($90). i got mine for about $25 from the local mustang supply house, http://www.cjponyparts.com.
You could just use an extension pipe from the plumbing section of the home store. 94-95s dont use the hex tube extension and this is what I did. It was 1/4" NPT.