Hayden 2765 fan clutch, more room?

Depends on the motor mounts and trans mount and how much you trust them I guess. You're at a smidge over 1/2" when all is said and done. Another thing to keep in mind is where the fan will be in relation to the shroud (if you have one). According to the experts on this site, if it's not perfectly 50/50 inside/outside the shroud, your cooling is compromised. Not sure there's too much truth to that though.