Hi everyone, First of all, sorry if this has been answered elsewhere, I couldn't find a thread that really answered my question. I bought a clutch for my truck (350sbc with a SM465 behind it) and I am trying to figure out if I need a larger flywheel or not. The block is a 3970010, meaning it was made between 1969-1979 which was before GM starting manufacturing 1-piece rear mains. From there I can deduce that I have a flywheel for a 2-piece rear main (168 tooth), but I don't know If the stock flywheel is a large enough diameter for a 12" DIA clutch. I've done some research that suggests I would need a 14" flywheel, but would I run into issues with the bell housing or starter? Any info you guys can give me would be super helpful, as this will be my first time changing out the clutch. This is the clutch kit I bought: SACHS K190902HD If I need to buy a flywheel, I was thinking about purchasing this one off of Jegs: https://www.jegs.com/i/JEGS/555/601205/10002/-1 Thanks!