need help 250-350 swap clutch?!?!

[Jeepfanatic]

Fired my motor today only to find I couldnt get my clutch to disengage! Everything outside (linkage) appears to work properly and I'm certain it's traveling far enough but still doesn't disengage. It's a 250 flywheel on a 350, with a four speed (3+granny). I believe I'm running a 350 clutch setup and I'm beginning to think this is my problem. Was I supposed to use the 250 clutch setup. Please any help is appreciated I'm doing this truck for a friend and feel terrible it's not drivable yet!
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