I would be very interested in these. You'll be getting a PM.
Quick questions, is the boss/port there for the fuel return. I know these are settup without it, but just capping it off can be problematic. Can it be tapped for use if wanted?
Also on parts interchangebility, would a rebuild kit for a 2F carb work just fine in these? Will a toyota secondary diaghram work in it? Also, on the dizzy, will a petronix kit bolt in, and do you just order early cap and wires for tuneups?
Looks like a great product though and a great alternative. I tried to retrofit mine, ended up with a 77 high altitude 2F carb on my 73 1F. It works pretty good, and there is not much smog stuff to worry about, but the carb is just overall tired. I had to JB weld the top stud in, as it was boken out, shafts are sloppy etc... I think it would run good with a new carb.
You also mentioned jetting, I'm at 6200 feet, jetting down is needed for me usually, would you have some jet options available, as Toyota jets are hard to come by?