Consider having your manifold opened up and your carb spacer being one of the many 4 hole with swirl patterns for better distibution and atomization. I personally like the 1" HVH. Also consider a carburator isolator from Comp Cams. I believe they are no longer made but can be found. Great for 4 cylinders. The net says they have had some problems with them but I don't know personally of any.....IMO they work..................JD
