I have just did a turbo 250 for demonstration purposes. It ran 5 psi thru a 500 holley 2 bbl and worked great. My first choice for a carb would have been a 390 4 bbl in a double pumper, not with vacum secondaries. Don't have one of those. So the 500 2 bbl sufficed.
For the 292 you have, as a reference, I run a turbonetics 62-1 T04 with a .84 exh housing and a P trim wheel. It can provide plenty of air.
Another good choice is a 60-1 with simular exh wheel and housing. I also think a .96 housing would be a better choice to help keep the turbo from spooling too fast. The housing and wheel are kind of like tuning aids for boost. Another thing, if you get a smaller exh houising (.68) , the turbo may become a exh restriction. It is a good idea to install a pressure port in the exh manifold to check the pressure under boost. You really do not want exh pressure to get to more than 2 time intake boost. That is a sign that the exh wheel and housing are too small and restricting you motor. Tom
