need alittle help please

ok i just got a 98, v6 5 spd mustang. i wanna drop a 302, 5.0 in there, change the rear end if need be and the transmission. what type of tranni and rear end should i get? also what is the stock size on the v6's rear end. and as i have read in some of the posts here, why does having the 23t speed gear give out a 10% off reading? what can i do to make it more exact? if any one can help i would apreciate all comments and replys. also my email is dragonkiller123456789@yahoo.com (dragonkiller123456789@yahoo.com) if anyone has links or would like to make a list of this to check out. also the last thing is does suspension really help any gain other than handling and should i stiffin up the sway bars and suspension alittle going to a v8 from a v6?

It would be much easier to sell the '98 and buy a '94-'95 GT. There is alot to do/change other than just the drivetrain and necessary physical modifications.