Welcome to the BB Jason!
I will third the recommondation for the 40 DCOEs for two reasons; 1) they are completely adequit for stock and slightly modified engines and 2) since they were the stock side draft issue for Alfa engines thru the 1750s, should be much more readily available at a cheaper price than the 45s.
The key in selecting a Weber is not the barrel size but the size of the choke (or venturi) based on the engine requirements. Stock 1750s came with a 32mm choke which will work for a 2l but will be somewhat restrictive at the high end especially with a modified engine with a higher redline. A 34mm choke would be a better choice. Keep in mind though, the largest choke that will fit in a 40 DCOE is 36mm. If your engine is highly modified, or you plan to modify it in the future, you may want to go with 45s which accepts chokes up to 40mm (I think).
If you can describe your engine mods, if any, that will help in determining the jetting.
Was that gentle enough?