You can use either blower and either vacuum setup.

If you use the 97 blower and want to use the 00 vacuum you simply cap those tree ports. Or you can hook it up like the second diagram.

If you use the 00 blower then you use the horseshoe vac line setup.

It's really up to you. Personally I like the 00 vac line setup better because GM made each nipple a different size from the other end and that's a pain to connect new lines to at times.