check the distance from the top of the distributor housing to the tip of the rotor. I believe there's a difference in height when the tall cap and rotor is used with a dizzy intended for the short rotor which can cause a mismatch when distributor parts are swapped around.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!