Agree with 69jeepcj . Add fuel to carburetor to attempt to start. Please test ignition primary and secondary circuit for voltage. See if you are getting voltage at the positive terminal ignition on and negative terminal while cranking. Also , verify that all wiring connections to starter solenoid are correct and no damage or shorts or any blown fusible links anywhere. Understanding that only a blower motor was swapped in but since there is a no start condition all items in the ignition circuit must be verified since there is no engine start when turning the key. Please start with voltage check at ignition coil . This will determine what direction to move in. If no voltage is found at coil , next the ignition feed from ignition switch to starter relay which feeds ignition coil must be checked. If voltage is found up to that point , it will be necessary to diagnose ignition module ( dura spark) . You previously posted there was spark but did every spark plug receive this same quality of spark and was the spark considered strong or weak ? Yes , as 69jeepcj said , it is proving difficult to make this repair over the net but we will continue to help in every way we can . We will,first need to know what results have been found this far. I.E. , is the fuel pump providing steady fuel to,at least fill,fill the float bowl and is voltage found at ignition coil. I also would like to say I regret the level of dismay your experiencing . I'm sure you don't want to give up but certainly want to know what positive direction to proceed. Please post your results as you can . Thank you for your reply and would like to see this a success . Greg