1969 Pontiac

I have a 1969 custom S convertible that has thi engine in it with a four barrel carb and four speed on floor. Has 45,000 miles on it. New cap, rotor, coil and wires. Wires are cheap looking packard. Car is hard starting and idles rough. Card is new as well. Could cheap wires cause this. Sounded good last night, but today it does not. Cant figure out how to time this either. Lol