727 concerns

i have a 727 in my 72 duster. the engine is a 360 with a 480 lift cam 292 duration. the trans shifted great, it had a stock converter in it. i installed a b&m 2200 stall. and also added a edelbrock victor intake. the new intake sits a tiny bit higher than my old streetmaster intake. i installed everything just as it was when i took it off. the throttle pressure linkage feels pretty good. when you pull the throttle all the way open you can still push on the rod about a 1/4 inch. thats how it was before. the trans has plenty of fluid. i went to drive it just now. i only had open headers. on the road it drives ok but it seems like its slipping. it doesnt seem to have the get up and go it had before. i understand that a stall will take alittle away from it but its only a 2200 stall. anything i should look for? or be concerned about? i havent tried manually shifting it yet. i need to adjust my shifter. also, the timing has just been set to where it wouldrun, i havent really tuned it in to 36 degrees total advance. it has the conversion gm hei dist on it. all in all the car just seems slower now.