OP drop the cam plate from a 15 to around a 13 that wi give you totall mechanicall at 26 instead of thirty and where does your Vac advance go total in INHG? Might need a small adjustment on it.
I don't have a 13, but I used a 9 (from the Super Six donor vehicle) which should give total mechanical of 18. The vacuum pod is stamped "11.0R". I plan to plot the new mechanical and vacuum curves today.
What is signified by the L and R stamps on the plate? On the bottom it's stamped "9R" and on top it's stamped "L". I understand 9 means 9 degrees of distributor advance, 18 degrees at crank. I'd upload a photo but I keep getting an error whenever I try.