Not a fan of the nylon button for anything but a flat tappet cam.

I just dent the cover and use the Comp 204 button.
The Indy cover clears this button as well.

Current pricing in Summit shows the 829’s are $515.99.

The 861’s are $585.99, and then you need to buy the 829-L link bars for $47.92........ $633.91 total.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads