nuts. but you CAN fit a vac adv to it, right? where can i get the parts? Did you exchange your unit with Mr Gasket?

according to MrGasket's catalog, Mallory does have a vacuum advance dual point dizzy http://www.mrgasket.com/pdf/DistributorsM.pdf
got to pg 13 of the catalog (pg10 of the pdf)
it's Series #27. It doesn't list prices for some reason, or at least I can't find any.

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'50 Chevy Fleetline DeLuxe ('55 235)
'48 Chevy Fleetmaster coupe ('60 235)
Chicago
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'59 Chevy BelAir (v8)
'50 Chevy Fleetline DeLuxe ('55 235)
'48 Chevy Fleetmaster coupe (late 261)
Chicago