On my turbo 421 combo-7.5 to 1 compression, big plenum dual carb manifold, custom turbo cam- I run 42* initial timing! It starts easily with a separate starter/ignition switch set up and runs fine, I start pulling timing at 5psi of boost and at max boost of 18-19 psi(so far) its at 27 degrees. The footbrake launch and throttle response was vastly improved when I bumped the initial up from 32*. I religously read plugs (usually cutting a couple open) and all is good. I am on a C16 type fuel and use water/meth as a chemical intercooler.
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