The 5-lug Ford Motorsport will get the 10" 4-lugs to 11" 5-lugs like I did on my 1978 Zephyr Z-7 with a 351W:
If you with to go 5-lug, see
http://www.svo73mm.cjb.net for excellent write-ups on how to convert.
I personally did the 1989 4-lug to M2300K Cobra 13" with PBR calipers (soon to install the new Brembos I just bought).
