any input

i have a 7.3/4 rearend what should i put in?i seen a 5 speed for sale out of a 75 a-body should i get that inplace of the four speed?

a friend was telling me to build a 440 but i was thinking about putting the 340 in since i have the block, whats the best choice?

i found the build sheet in the back seat,how do i figure out the options it had and what were the paint schemes for that year.

I bet alot of you oldschool guys are shaking your head but im just getting into this, any info will help .