Im not really familiar with clutch/transmission swapping so i have a couple of questions.

If i have a z6 or y8 block, will a 91ex/si 5 speed transmission bolt right up?

As of now i have the stock a6 block with ex/si matching trannsmission, i will be swapping the block to either a y8(i have a a6/y8 mini), or a z6.

Would everything bolt directly to the blocks? no matter the year difference?

Also, confused on which clutch to go with, I will be wiring vtec but thats it. No racing, boost, or anything like that.

Best quality for freeway driving i guess you could say.