Bluebird, I can’t speak to the appropriate pulley diameters, year appropriate balancer, power steering brackets,... but I don’t think anyone really cares...and it wasn’t the question you asked. It’s like when you go to a car show/ cruise night, and the local “expert†feels the need to share his “knowledge†regarding the correctness of your hood tach, or headrests, or steering wheel...or can’t understand why “ no one paints the center exhaust portsâ€(yes. All are true) Usually, they’ll start telling you that the USED to have a ‘66 Camaro with the original big block 428...a lot of unsolicited BS.
Re your query: My ‘68 has the 2 brackets. However, they don’t line up perfectly anymore because I’m using an E’brock intake which, apparently, is a bit different at that mounting point than the original. They still work just fine. Let me know if you want a photo just to campare.
I'm a hobbyist. Not a professional. Don't be hatin'!