I'm new to your forum, and have to say I already basically found the answer to my first question by reading/searching your posts - thank you.
I have a '69 that I am transplanting a mid '90s injected engine into. In attempting to keep things as correct as possible, I'm setting it up to run the proper pulleys, water + PS pumps, etc. from '69. I obtained all the brackets/pulleys from a local Chevy yard and bought a new long water pump. Everything lines up well, except the water pump pulley. The bolt circle of the pulley is too small for the pump. I checked your forum and found a post where '68 and older is 1.75" and '69 and newer is 2.125" (thanks to stingr69 & others). Apparently I have the wrong pulley.
I'm amazed I couldn't find this anywhere else on the net.
I still am curious to know if anyone has the proper dimension for the correct pulley (#3932402) from the flange to the back or the groove?
For that matter, does anyone know of these depth dimensions for the rest of the pulleys and ideally the bracket relationships? There is a lot of info (such as here and camaros.org) that list numbers, but not much dimensional detail.
One last thing - does anyone know the center to center distance of the mounting holes for the '69 externally regulated alternator? I am going to use the internally regulated '90s unit that came with the motor and don't want to butcher the '69 brackets. I'll make an adapter as needed, but need the correct dimension.
Thanks all, and hope I can return the favor in the future.