1965-1975 BBC Gen IV Mark IV large round port intake manifold--high performance 4 barrel with large round ports as high performance variation ---NOT lower performance peanut port.
Dated I -17-75 or Sept 17th 1975
Very good used condition--removed from good running engine. Can sand blast and repaint for $95.00 more, optional
This uses the 700 and 800 cfm quadrajet but I can provide an adapter for $30 more to allow you to run Holley or Edelbrock carb.