thanks for the replies. looks like whenever I get to FWF (2 years from now???) and if going with a Type 1, it will be important above all, to keep the heads cool. Secondary to that, buy the best heads/valves etc and make sure the machining is right. The other issue is to use the best forged crankshaft, hub and front bearing choice and make sure that is installed properly as well.
And finally, run the engine properly, richen to keep cool when under higher power. I have nt seen as much issues with ignition system, carb, etc. One issue I wonder about is the new aerovee turbo option, since these heads and their temps are a key issue, one wonders about pushing that much more thermally with the use of a turbocharger (and no intercooler). We all know that turbo will compress the air charge increasing the temperature, and the added power adds heat from inside the cylinder too. Under boost, those heads are taking substantial additional heat from both sides as far as I can see.