[tonyt]

OK, ford 392 crate motor, 16 degrees initial timing, 18 advance for 34 total. 55 idle jets, 80 idle jet holder, 165 mains, 140 air corrector, 40 mm venturies.
Idles well, pulls clean and strong from 1k up to about 3800-4000, then starts to run poorly (almost like a miss) through 4500, and wont pull past 5k. Anyone have any ideas?