AC has been shipping them with spacers for a while to take up the extra length on on the rear 2 bolts so it shouldn't be a problem.

by "heater coil" I think you mean heater core. just watch the the two rubber heater core hoses on the passenger side firewall to make sure they don't pull too much when lifting. I have always pulled them just to be safe. If you break one of the plastic nipples off of the heater core you will be a very pissed off person because I heard that job sucks.

you don't raise the radiator, you actually lower it. It is optional with the 2" because you can just pull the lower removable section of the cowl off. I personally would drop the radiator and keep the clip in piece in there but that is just cause i am a picky SOB