As long as we're here. I'm a little puzzled. I have had HS6's for years and love them. I just started messing with different needles and am amazed at the differences. I get 4.5 miles per gallon MORE with ZH than KN. The car feels like it's starving and probably is.
http://www.georger.com/su_needles.htm is a link to a chart I did with some popular profiles. Take a look and see the differences. ZH is the bottom and very lean for a B20. My engine is .030 over and compression is 9.8 and I use premium grade fuel. On ZH it felt like I had a trailer fully loaded. KN's are richer and better. I have W02's in ther now and the milage is down to 21.5 or so but it has plenty of grunt. Today I'm going to put in the RH which are richer in the lower range than KN but leaner than W02. These are all new needles so the test should be kinda valid and I'll be driving 300 miles per week on the highway. I do have a question for carb experts. I have fuel squirting out of the front bowl at idle and spilling to the ground. Tapping it doesn't seem to change much but accelerating uses the fuel and it stops. Sometimes it will hold an idle without leaking. I have changed out the whole top of the bowl and still it might leak. What is the pressure that SU's usually get from the mechanical fuel pump. I have an electrical NAPA pump that gives 4-6 lbs. Is this the right pressure? I have changed the needle and seat for the float but I must be missing something when it happens across my changes. Comments?

Christopher Virgilthevolvo V2