ok for high boost? I ran mid 20s for a while (eventually blew the head gasket and took a chunk of the head with it) - the carb itself had no trouble with it. If size was a concern you can also look at a 500 2 barrel (and remember that the 2 barrels are flow rated at a different pressrue drop to the 4 barrels so a 500 holley is actually about the equivalent of 350cfm on the 4 barrel test pressure drop)