In my opinion you don't need a brake booster. Throughout my brake mod project I was especially concerned about this item, but after speaking to and driving my friend's '89 notch with nearly the same brake kit I didn't see a need. My car brakes very hard and I don't see how a larger booster would help.I throw my .02 in there.
I’ve been collecting eBay parts and refinishing them for this swap. Between my front PBR calipers (not cobra but upgrade nonetheless), and my spindles, I’m in for $215 from ebay, and a few more dollars for pistons, seals, and caliper to spindle bolts. Another $70 for brand new hubs. So call it $300. I also got a 1”bore MC from an older model Lincoln for $25. (hoping this works). Still need the booster.
I was real close to buying that rear drum axle swap off LMR. I hate these wheels and can’t wait to see it the way I imagine it, with the wheels I want.
However, I am now going to continue on the disc path and do the rears too. Much like @Habu135 , I want to do this once, and do it right. I want it lowered too, so I may even wait to get those parts so I can really just do it once!
I have more parts to collect for sure, and because I’m ‘86, I need new front struts too (more money). Depending on the struts i choose, and other misc. (brake lines, booster, hardware, prop valve, etc) I’m done with the front for prob between 6 and 7 hundred. In the end, if I’m patient enough, I’ll hopefully be happy with the end result, and know I did it right. I’m watching daily for rear calipers that I can refinish, but I may end up just buying remans. We’ll see.
I guess what I’m trying to say, if you have the means, don’t skimp out. It it means waiting a bit until you do, you’ll be much happier with the car in the end. And there are definitely ways to get an upgraded setup without breaking the bank on an all inclusive kit.