dizzy 'bout dizzies

[regis101]

Greetings. I only have a bentley as a source of ignition curves. My application is for a stock 78 Westy with a 2.0 hydro engine and stock FI. The zippy-do rebuilt distributor exhibits enough side to side slop that it concerns me. I feel that it is causing erratic timing at idle. I also have a dizzy from a 73 bus/manual trans. It is nice and tight. The bentley does not seem clear enough for me to understand if the curves are close enough that will allow me to swap it over while changing only the vacuum pod from the 78. I could swap over all internals from one to another but am just curious about any difference in curves. Thanks, Regis