Without the like of GAMIjectors fuel flows are more often than not uneven across your cylinders making lean of peak operation imprecise. I have been advised by engineers and other owners alike that they all run slightly rich of peak with only an EGT guage (as this only tells the tale from one only of your cylinders).
Try the Lycoming website for more thorough advice as I am not an engineer and can't give you the full technical reasons for it; I have however a couple of thousand hours experience operating Lycoming and Continental IO-470/520/540 but not much on carburreted variants.
Feel free to accept or decline advice on these forums with your own judgement; I shall not be instructing you to ignore other poster's advice as I consider that to be quite rude.