Hesitation at 2500 RPM

I have a original 327 (70k miles) with a Quad 4 barrel 1968 Coupe. Ignition has been changed to a Mallory 6001M somewhere around 2009. Starts and idles great but when I pass through 2500 rpm and up to about 3000, there’s a slight hesitation in the engine. The car even jerks a little bit, like starting early in a new gear. Clutch is new last year and just past break-in period. 

jeff,sounds like advance could be sticking, easy test get a timing light raise rpm to 3500 see if lite is smooth all the way up or if it hesitates ,best with two people .could be electrical ck wiring to unit and grounding not just unit but main car grd .lastly pop ff cap and ck wiring and machanical stuff lke rotor is it tight or loose .check springs couuld be rusty and needs cleaning after all its 17 yrs old ,would also help whats the climate like were u r locaded hot and humid ext,lasty ive had more then one unilites that had heat issues pop off reader and clean and coat with some type dialectric grease ,call mallory ,mine were in the mid 702 and 80s,hope this works,mike p