Jim,
The easiest front end conversion would be a Suzuki GSXR front. Take a look at Cognitomoto.com. Devin has hubs that will allow you to run spoked wheels with the modern forks and brakes. He has all of the parts you will need to swap in a 750 length steering stem into a GSXR triple or he will even do it for you. He will even sell you a turn key kit to swap onto your 750.
Don