Mechanical setup

Hello all, I am currently running a mildly built 440 in 71 duster, chasing some cooling issues. Running twin flex lite electric fans, messiere electric pump and an older 3 core what i think is a clean 26" radiator. I am hovering around 205/208 , so I ordered a 2 core alum from champion, am going to see if that helps, but am also starting to wondering if i should try a full mechanical setup instead. New waterpump , fan etc. Problem is I have 0 idea where to start, what pump, what size pulleys, fans etc. Can you all point me in the right direction for what size mechanical parts, maybe some part #s if you have them handy. Ive been doing a ton of research but I am spinning in circles trhing to find a consise answer. Thank you all in advance, this place is always a great help.