Didn't really have to change anything. Mostly just had to space things out to where the brackets were in the right position for everything to line up right and get some new bolts in the corrct lengths to work. I did buy a set of conversion brackets off eBay for $40. I also had to trim down the outside circumference of a set of drum hubs to fit inside the LS rotors( took me about 1/2 HR for each with a 4" grinding wheel). I did already have stock 69 discs on the front but truthfully it would have been an easier conversion on a drum brake car due to the differences in the spindles. I also had to replace the wheel studs with longer ones which required reaming the stud holes in the hubs out for studs with a larger diameter knurl. Oh yeah, and all new bearings of course. I wouldn't call this a bolt on gig. It was a process. Step by step it came together.

The wheel spacers... I'm running those BMW rims and they have a lot of back spacing. The backs went on fine but because I'm also running 1/2" taller upper ball joint in the tubular control arms the inside corner of the rim was hitting the UCA when I turned the wheel. So I had some 10mm spacers made with the raised hub centric ring in the center. Gave me enough clearance at full turn so it doesn't touch. I had to run them on the old brake set as well. Also was one of the reasons I needed longer studs.

The pads have about 1sq. In. more pad surface than the 69s but given their size I guess it's a significant increase, percentage-wise. Plus the new ones have a much wider pressure area due to the dual Pistons instead of the single and the rotor is just over an inch bigger diameter so maybe will handle the heat a little better too. Plus the calipers are aluminum so I might have shaved a couple of pounds( always a good thing).