Q&A for a`65GT

ok here goes i am gathering parts to "update"my GT drive train is almost all collected still need a 10 1/2 flywheel for 318 now for some tech info! would it be ok(or recomended different)from some of you that HAVE done /6 to SB in an early A struts?use? tortion bars?rear leafs?? and i am pretty sure il need better brakes but do NOT want to sacrifice my Rallies(14'sbp)what if any disc setup is cost effective and still let me keep 14'sbp?? i AM upgrading rear to a 8 3/4big drum sbp>
. one more thing il be using an A833 4spd i want to put 323shure grip but "someone"said i wont like the "tall" first gear im lookin at the 323s for about2400rpms @65mph any numbers you guys(or gals) may have is greatly cociderd and app. thanx