Here is some info I got when looking into fixing up my 302... I got my info from people on here, from Edelbrock, and from Summit racing in case your wanting to know where my info is comming from. Anyways, 650 is too big for a 302. 302 uses, what 480cfm I think it is, so 500cfm is the right carb. I was going to get a 650 from Edelbrock and them and Summit told me not to that it's too big and I don't need it.
Also, the best set up for street applications and to run from idle to 5500 rpms is the Edelbrock 500cfm performer series carb with the performer series manifold. Now what I would reccommend if you get a polished manifold is to spend a little tiny bit more money and get the endurashine I think it's called (it's their newest finish). What it is is it has a clear powder coat baked over it so you never have to polish it and it will never dull or yellow on you. I was going to get a polished one and do my own clear powder coating but saw that and thought that is easy and saves me time having to do it myself... To me that is worth it.
Everytime I get info on either Holley or Edelbrock then this is what I hear and what I get.... Edelbrock is more for a street application where power is needed through all ranges and then Holley, etc is better or more for racing applications to fine tune everything, etc and Edelbrock carbs are already set up, etc....

That is all I really know on this subject and if I went any further to answer your questions then I wont be 100% so I don't wanna give you false information. I have a friend with a 31 chevy that has a 350 in it and it's burning rich and smells like crazy and he is getting a new higher output I guess you can say, distributor and MSD ignition box to burn hotter.
Well hope this helped and good luck!
Good luck!