there were many threads and lots of pictures of this on th old forum.
I hate to sound redundant, but call Big John
http://sledheadracing.net/
He did my 99x 670 to a 151. D&R with a setback and extensions. geared and clutched and it ran awsome. I rode it for three years and never had a breakdown. Set your clickers to match elevation and you are good to go.
Go with a 151. you won't be disappointed.
B-
