Bob, thanks for th clarification. Not being a GM guy per se, they are all the same, GM, GMC, Chevrolet etc.
I am sure the bowtie guys will give me a learnin'.
Always have my eyes open in the rag mags, Kijiji etc.
What I need is a WW2 235 but I want the extra HP and torque etc.
If I have to rebuild my 235 I might as well get a 261...
Now, for my next question; how does a 261 mount compared to a stock 235???