Bill,
This may be a long shot, but try contacting this company,
they specialize in all things 6 cylinder.
CLIFFORD PERFORMANCE PRODUCTS INC.
22850 Sheffield Crt
Wildomar, CA 92595
1-951-471-1161 or Fax 1-951-471-0993
www.cliffordperformance.net
email for tech:
Larry@cliffordperformance.net