MEK,
I use a 1" open spacer and when I had the stock manifold, there were four bolts going from the spacer to the manifold, and four bolts up thru the spacer to the carb.
When I swapped to a MP intake, the bolt holes went straight down from the carb, thru the spacer to the intake. If you have this set-up, lemme know. I THINK you're in Canada (?) and I have the code for the proper Canadian Tire bolts that work for this set-up. Took A LOT of trial and error to get it right, but I found 'em.