1974 Duster restore or not

My car has front disc, power steering brakes and ac. What concerns me the most is the rust at the lower windshield, when it rains the floor fills up with water. After checking out some of the restoration's on here I'm gonna keep it and put the 6 in it for now. Another member has a rebuilt head and a lunati cam & lifters and a four barrel intake that I'm going to buy. I need to find some headers so if anybody knows of a set for sale let me know. I'll be posting pics of my progress.