Technical Nailhead dual quad timing

I'm looking to have my magneto set up with advance instead of locked down and I've read that the dual quad engines ran 12* initial and 32* total, but I haven't found how quick it comes in. I'm new to these engines so if my numbers are wrong I'd appreciate what you guys know. Thanks for any info, Joe

 

btt

 

My friend Ed Starr at Mag Tech Ignition here in Indy can do that but be prepared to spend some bucks . The adding of the advance plates etc can be expensive.....His number is 317-241-4100