Generally speaking, without using any sort of standard and accurate measuring device, you are unlikely to "feel" seat of the pants a change of one jet size in the secondaries at wide open throttle/
It is possible however that if you are on the border of a lean condition and detonating, for instance, a one jet change could make a difference. You'd be more likely to notice a jet change in the primaries, driving at part throttle.
In the next issue (later this week) you will see an article on carb tuning using a wide band 02 sensor (see Innovate ads on the right). With this device you can see the impact one jet change has one Air/Fuel ratio and acceleration.
Is it laying down in high gear at the track? Probably fuel delivery problem under load, usual culprit is a stock, or near-stock fuel system.
Doubtful that one jet size would be noticable in anything but a dangerously lean condition; Holley recommends stepping up in 2 or 4-size increments until the engine slows down. There is a lot of good info in their catalog, and several good books.
after it gets to 6k......it jus stops pulling like it does under 6 and i know that cam makes power past 6k.........i was just thinking there wasnt enough fuel gettin threw because of the jets being to small....but i had a stock pump on it b4 and i jus put a holley blue on soo this weekend ill see what happens