Might check with this guy: http://tucson.craigslist.org/pts/2855478518.html

Heres some, read near the end: http://phoenix.craigslist.org/evl/pts/2911753671.html

Not sure what it would take to use these: http://www.ebay.com/itm/4-6L-DOHC-Cy...#ht_500wt_1133