63 Big Valve West Coast Super Rocket. The 61 on SRs had the Spitfire cam and the good Triumph 4 spring clutch. These west coast bikes were made to order for Hap Alzina. He demanded higher compression (9 to one vs 8.5 east coast and UK) and more chrome. The West coast SRs also came with cowhorn bars, which I tried to love, but just couldn't.
The front wheel and brake are from a 68 A65 Lightning. There is a small modification to either fork leg or brake plate required. Once fettled, it will lock the wheel on pavement if really squeezed.
Normal use, it's a two finger brake.
Here is the bike at a show