Ron, I feel your pain, you do get use to some cars and the sensation of speed, I have been experiminting with parts on my Duster this year, found that I needed .120 needles in seats in all the Holley carbs. regardless of which rated CFM and type, 4150 0r 4500, 850 or 1050 CFM and in between. Last month I took the car to Woodburn for the Mopar race,I ran it some on Friday afternoons test and tune with the 850 Holley DP and 400-2 intake, it ran a little slower with the bigger needle and seat than the month before over there but the wideban showed it to be pig rich. I switch intakes and carbs. to a 1050 Dominator and a 400-3 intake, the car ran 10.40s at 126 MPH with the 850 and picked up to 10.03 at 133.45 MPH, I didn't feel that it picked up that much It did pull a lot better on the other end, ended up it had one .110 needles and seat in the rear float bowl and a .120 in the front when i got it home(the wideban showed it to be arginall lean) I forgot to check both before using it:o I ran it at Madras(1/8 mile) at the last race with the new .120 needle and seat in the rear and it picked up from 6.80 at 101 MPH to 6.48 at 105.7 MPH, no other changes I didn't feel that change either