Evans waterless coolant
My suggestion is to plot out the distributor timing. Unless you have an untouched original distributor there's really no way to know what the advance curve looks like.
For example, if we look at the timing spec's for a non-CAP 1967 225 they look like this.
Even if you set the initial at the same or close to the same as factory, if the advance has a different shape, you might find timing that measures like shown with the circles.
That could cause ping at full throttle.
The best I could figure after carefully rereading the Circle Track magazine article and what's now available on the web, the use of the Evans Mecca system to allow higher compression was 'proven' with a reverse flow set up. IIRC they called it the 'level 3' setup.
My suggestion is to plot out the distributor timing. Unless you have an untouched original distributor there's really no way to know what the advance curve looks like.
For example, if we look at the timing spec's for a non-CAP 1967 225 they look like this.
Even if you set the initial at the same or close to the same as factory, if the advance has a different shape, you might find timing that measures like shown with the circles.
That could cause ping at full throttle.