So I was at the yard today for a replacement radio for the wife's Jeep and took a look through the old section where there was a 62 Belvedere 4 door I saw a few times before. Still had the original poly 318, no mods. I took out the original points distributor to compare the cam measurements with mine. This one was .994" point to point. Mine is .990". I wondered why I had to have only .012" gap to get 30° dwell. The weird part was the stop plate that had a #8 stamping, for 16° mechanical advance, which would allow 18-20° initial with no modifications. I wasn't even aware that these plates came like this originally. Mine has a 15 stamping for 30° mechanical, but I use an FBO plate in order to get 18° mechanical. The $2 the yard charged me was nice too.