Have fun sealing the head and water passage to cylinder. Your asking for way too much bore from that cylinder. I'm not saying it can't be done, just that your exceeding the capability of the parts you want to use, you will spend less money and be further ahead to use a sled cylinder and get the cases welded up to work with it.
I've done all the homework with this setup from 302-344 and I know anything beyond that is not going to be a reliable daily rider.
As much as I like Suzuki, your not going to compete with a properly set up CP cylindered Honda, the Transfer layout of the Suzuki can't support the flow necessary to make the same power.