[NCGuy68]

Ed.....yes, RPO L78 is 396/375 iron heads. RPO L89 is with alum. heads of which only 272 were factory produced. The following are the numbers from a friends unmolested 4th week of April built 68 L78:

Block: 3935440 cast March 21, 68.
Head: 3919840 cast Dec. 21, 67.
Intake: 3933163 Alum.
Exhaust: (Smog) L. 3909879 R. 3916178.
Dist: 1111170 cast Feb. 20, 68.
Carb: 3923289-DZ assembled April 3, 68.
Bell house: 3899621
Alt: 1100814 (37 Amp.) assembled April 18, 68.

One place to start looking for parts is the Charlotte Autofair in early April at the speedway. Its a very large swap meet. In addition, I'am negotiating with a guy on some misc. parts. A 621 bellhousing is in the mix but we havn't made a deal yet.

Hope this is helpful to you.