from the rules on the site:
http://psmcdr.com/10.html
Fuel System
The carburetor must be correct for the year, make, and horsepower claimed. Jetting and metering changes are permitted. THE CHOKE ASSEMBLY MUST BE IN PLACE AND FUNCTIONAL! Mechanical secondary carbs cannot be substituted if vacuum operated units were original to the car. Mechanical fuel pumps must be retained. Electric fuel pumps are NOT allowed. No fuel pressure gauges are allowed anywhere along the fuel system. Factory fuel lines are required and must be correct size. No rubber lines allowed unless originally equipped as such. No fuel cells are allowed