mach1mstng

Im looking to put a 5 speed in my 1970 mach1 I have a t5 that needs a rebuild in my 89 lx but I hate to take the car part I found a t45 out of a 1998 cobra for $250 that needs a second gear syncro so heres the deal I know more about the old ones than i do about the new ones is the t45 a tremec is it better is that a good price and is there any thing else i should know thanks alot for the help