Are distributors interchangeable on BBC’s & SBC’s?

greymouser7 said
Spark plug gap recommendations please!

Again, same answer. That depends. Standard starting point is .035. But if you are running MSD on a track car and maybe a little hotter plug on race fuel. Open those babies up a little bit. .042 in a NA mid 10's 454 is my sweet spot.

Next you're going to asking timing I'm sure.