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A38Valiant said
If that 318 is 71 down and the 360 is 72 up, you won't bolt the crank pulley on. The bolt pattern changed in 72. The 71 and down has one offset bolt, 72 and up is symmetrical.

.....I didn't know that. So my '68 318 crank pulley won't bolt up to my later 340 crank? That's a problem..