I did Zippers 103" muscle kit (among other things...see below lol!) and I couldn't be happier. 16K flawless miles and it's a rocket! My builder has been using their kits for years and swears by them.
107 w/ T-Man cylinders and pistons, Zipper's stage 3 heads, Feuling 594 reaper cams, HPI 58mm elliptical TB, S&S roller rockers+forged shafts+premium lifters, TMax, D&D, S&S cam plate+pump, Evolution clutch+no comp sprocket, Baker chain tensioner, bottom end by Revolution w/H beams+Timken, Jagg w/fan, Baker DD7 & +1.5 pan, 14" Vindikta bars, Legend Axeo cartridge forks+Revo-A, HD Blade 18+18, Daymakers, Russell Day-Long.