A 7 blade 18" fan and Fan clutch
This is the fan I bought. SBC, short WP
https://www.npdlink.com/product/fan-...1967&year=1967
and Fan Clutch
https://www.npdlink.com/product/clut...%3D0%26year%3D
the center of fan blade is about 2" from face of WP pulley fan clutch bolts to. If you needed the fan to be further out you can just add a spacer or find a fan clutch with a longer neck