over carbed???

morning all!, question? i have what i was told is a crate 360hp 360 ci, now im not sure if it is or how to tell, (if anybody knows, please tell me) the guy that built the car was kind-of-a-hack(im finding out as i go thru things) but i have a edlbrock 1407 carb(750cfm) on my 69 gts i had an avs carb that was 625 cfm, is the 750 too much? car seems heavy/rich kind-of lazy off the line--- now i need to recheck timing and a few other things, but my 69 340 was very stout and alot better out of the hole(69 had 3.91s my 67 has 3.55s but still !! any body have any ideas or things to look at and try, let me know, thanks! have a great day all!!8)