231 Cylinder heads and header question

[klaird]

Are all 231 cylinder head exhaust ports the same? Are they the same as other v6 exhaust ports? In other words, will headers made for the buick v6s all measure/fit up the same, or are there differences between stage 1, stage 2, etc. and 231 versus other v6s in the way exhaust headers would fit up. There is a set of headers for sale on this website and I'm looking for a way to verify they will fit my 231.

 

[King_V]

I'm given to understand that the 231 heads changed in 1979 - I've come across a reference that the 1979 and later heads are called the "tall port" or "tall head" variety?

There are head casting numbers listed, among other parts, here: http://www.gnttype.org/general/v6hist.html