burnin the midnight oil

Awesome! You're going to want to wrap or thermally coat those headers or you will likely have massive percolation issues with those SU HIF carbs. Clever how you've adapted the original rotating-rod throttle control to the SUs. Will be interested to see what you wind up with for air cleaners. Good resource for SU parts and accessories is…SU.

Triple SU intakes are still available from Australia; see here. At one time I had several different 3xSU intake setups; see here for pics.