I picked up a cast iron 4 bbl intake last night. The casting number is 4323352-3 and I know it came of a 360 when it was replaced by an aluminum one. There are 2 threaded holes in the plenums that are new to me. What are they for? Also, I noticed the plate on the bottom has press in retainers, but there's a gap between the plate and the bottom of the intake.
I can take pics if anyone doesn't know what I'm talking about.