Found my dads original 1971 duster!
Not sure what fan clutch you have but I feel for you on the tightness of the engine to the radiator. Been there, done that, have the scars on the knuckles to prove it!
Hayden is the usual supllier for fan clutches. Something I did was use their "shortie" fan clutch made for just such situations. Hayden #2947 fan clutch. I don't recall how much shorter it is but I want to say something like 3/4" or maybe a tad more. It made a difference for me with my 71 Demon 340.
Not sure what fan clutch you have but I feel for you on the tightness of the engine to the radiator. Been there, done that, have the scars on the knuckles to prove it!
Hayden is the usual supllier for fan clutches. Something I did was use their "shortie" fan clutch made for just such situations. Hayden #2947 fan clutch. I don't recall how much shorter it is but I want to say something like 3/4" or maybe a tad more. It made a difference for me with my 71 Demon 340.