Breaking down a '72 MFI motor that was poked out to 2.9. I have a question about the heads.

date stamped 11-71 the # on them is 911-104-302-OR. I believe them to be 1972 E heads that have had the exhaust enlarged to S spec and a twin plug machining at some point in their lives.

Intake and exhaust measure 32 and 35

Valve size is roughly 40mm and 45mm

I will have to clean them and make a proper measure in MM with a proper tool. Looking through BA's handbook and I don't see any production heads with these measurements.

They are twin plug with the smaller plugs on the bottoms.

Any help?