will Air gap RPM manifold fit ???

I think it's different for some cars. I have a 73 swinger and was told I'll be fine. I ended up not being able to run a spacer and it still sits to close for comfort for my liking. Get a drop base and you should be ok with no spacer. Also if you are a Eddie carb then you have to get a banjo fitting for the fuel line to run a drop base.