clutch fan or not?

AJ/FormS said
The best is; a 7-blade, direct-drive, hi-attack, no-flex,all-steel fan, in a shroud, under a sealed to the core-support hood.

Whether or not you need the best is another answer

Are you referring to the weather stripping that you can get that goes under the hood? Would that affect engine temperature as I plan to cut out the middle of the hood and use the cake pan to seal to my dual snorkel?