am I going to fry something??

on my fairly radical 408 I have a Mallory magnetic breakerless distributor with a Mallory 6AL box. When the engine is warm it is turning over slow due to timing. I am running 24 initial with 34 total, no vacuum advance. I have a switch to turn on the ignition. No problem when cold. Can I leave the ignition switch off, get the engine rotating and then turn the ignition on to fire? ....at least when I am having a bump back issue that is. Am I going to toast the sparky things? I know, I know.....I should have purchased a spark retard box. The little redhead wanted to buy groceries that week!

Thanks.....!!