These cars were not designed to run with alcohol in the gas. The original neoprene hose was resistant to gasoline, but not to alcohol. Rubber and alcohol don't mix because alcohol is an ACIDIC organic solvent. Over time it will dissolve the neoprene hose to the point were it leaks. the rubber crumbs will clog the fuel filter.
You have to replace all of the factory neoprene hose with a PTFE (Teflon plastic) lined fuel line:
The hose should have a green stripe to show that it is resistant to gas and alcohol.
Not only is the hose at risk, but so are the steel fuel lines, the galvanized steel gas tank and the pot metal carburetor are at risk of chemical attack. The pictures I have illustrate what alcohol does to a Holley 4150 carburetor, but your Rochester or Carter carb are equally at risk because they were all made out of di-chromate clad pot metal cast carb parts.
So to counteract the corrosive effects of alcohol Holley has recast these parts (those that are not billet) out of solid aluminum and then has them anodized green to protect the aluminum. With any anodized part the protection lasts only so long as the sacrificial metal remains chemically active. The coating is consumed over time.
Quick Fuel and Barry Grant did the same thing with their Holley clones (Barry Grant is now a wholly owned subsidy of Holley so there isn't the copyright infringement question that makes me wonder why Colt Industries that owned Holley when these carbs first appeared on the market didn't sue them) only anodizing them in red or purple instead of the Holley Green that matches the industry standard for gasohol.
So a new carb that is designed to work with gasohol will not be affected, but your old carb will be adversely affected. The only solution for a museum piece is to run straight gasoline without any alcohol in it such as race gas available in five gallon cans from VP Sunoco, or other sources. Shipping fees and disposal of the hazardous waste (the empty can) drives up the cost, but I do not recommend buying it in 55 gallon drums like I used to do before 9-11 as it decomposes within days (the higher octane additives evaporate quickly once the drum is opened). There are still gas stations in most big towns at least in the South-east that still sell straight high octane lead free gas, but usually only on a Friday from a locked pump as there is no road tax associated with the gas sale. As such it has to go into an empty 55 gallon drum left over from my previous buying race gas, or five gallon gas cans. It is also legal to put it in your trailered race car (a trailered car without a license plate).