Several years ago I built my C4 with parts from Broader & a lot of help here (thanks!). Motor (68 Mustang) was about 460 HP, ran 11.70s. Got about 1000 passes on it; still going strong. I'm building a new motor and it'll be 550 HP. I plan to freshen the trans. What other upgrades should I do to be sure it lives? Current build: 1974 C4 (26/24 spline shaft) Front pump oiling mod (removed spring & check ball) 5 red clutches in both drums #9 thrust washer oiling mod Drilled reverse/high clutch drum Rollerized 3-gear planetary (from Broader) Replaced #4 Thrust with Torrington (From Broader) Aluminum deep +1 quart pan Kevlar rear band A-code servo Was thinking the following: Hardened input shaft H-code servo Is the Broader #9 needle bearing kit worth doing? Thanks.