What I understand from what you wrote If you have that much duration that much lift that much compression... I'm going to go ahead and assume you have an MSD setup with no vacuum advance but just mechanical. In which case you would probably be putting the lightest Springs available. Then one of two things having initial way over 20 send all in at 34 to start with and see where it back down to. Likely you have a 12 degree swings and it will go back down to 22 for your initial which is where mine is at.. on the other hand you could just lock it out at 34 and start doing passes down the track and figuring out what's best, but you would need a start retard....
