Hey Mike, start with this.
www.oldchevytrucks.com/Tips/261_six.htm Then do a search using "261" here and you will find tons of info.
Lloyd, that's great. Keep up the progress report. I'm doing the same build as you pretty much only my tranny is an sm420 w/ a Gear Vendors O.D. and the original 3:90 posi. I have yet to assemble the motor, but the machine shop work including the balancing is done.
