need some fan info please

It is way too close. But that may be because the radiator is thicker than what normally is found on a Slant car.

The problem with attempting to use the factory stuff is that slant's got a fixed, 4-blade fan that mounts using a spacer about 2-1/2" thick. That'll never go in that space you have. Besides, the 4-blade is a waste of time anyway with that upgraded radiator.

The next possibility is the A/C and HD cooling fan, which is a larger flex fan, but again mounts with a spacer and probably won't go in there easily, if at all.

What you probably will need to use is a clutch fan for a slant-6 M-body, like a Diplomat or Gran Fury. They are quite thin and it might just sneak in there, plus it uses no spacer. I have one I tried to sell here and nobody wanted it.