Stop setting your timing it has nothing to do with the idle. First you do a link and sync. And if the motor would not start out of the water without starting fluid that is a problem. Set the carb low speed screw at 1.5 turns out to start. But I will be totally honest with you it is an L drive...
NO NO NO first you pull the heads on the 135 and see if you have the high compression ones. If you have those they are worth more than both motors combined!!!!
That motor should have water coming out of the exhaust reliefs in about 30 seconds not minutes. If it didnt warm up you may have a bad thermostat time to check that to.