| Dave,
I like to use PPG DP90 (black) epoxy primer and any black topcoat will do 
( PPG 9300 DCC ) this is a urethane which holds up very well to oils and gas 
grease ect. I like to add a little flatteneing agent to die down the 
urethanes gloss a little to replicate the old enamel look. Ive found that a 
thinned out coat of DP90 and 2 coats of top color work fine,dont go too 
thick or you can lose details of numbers and stampings. Factory didnt worry 
about runs or drips either so add a few of those and your looking original !
hope this helps,
Carroll Phillips  Top Down Restorations 
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