Are you sure the squeek is coming from the carb and not the alternator? The reason I ask is since you stuck a new dizzy, coil and wiring harness in it, something maybe drawing more current than the alternator is able to provide. If this is the case, when the extra load is on the alternator it makes it harder for the shaft to turn and can cause your belt squeel. I don't know if that is what is going on here it's just a suggestion.

As for the other part, when you set the #1 to TDC, how did you do it? ie. pull #1 spark plug, stick your thumb/finger in the hole and turn the motor over until the built up air pressure pushed your finger out of the hole? If so, where ever the rotor is pointing when that happens is the #1. Verify that you have it set to the correct firing order, 18436572 unless you have a cam that is set up to allow you to run an alternate firing order. While this is probably highly unlikely, it is possible.

Good Luck,
Firechicken