Hi.
I installed the pertronix ignition module and am very happy with it. When you order yours make sure you get the correct ohm rating for the coil you can buy along with your pertronix unit. Following the directions carefully is the other important step(s)..There are numerous posts here in this forum in order to make the choice which is best for you ( a crane unit is also available which avoids the self-destruct tendency of the Pertronix unit if you leave the ignition on for an inordinate amount of time....Check the posts here, read them, and then you will be better informed.
As far as the heater core and the blower motor which moves the warm air and cool air around is concerned, you can find these parts in different places-just shop around; however, it is best to check fuses, determine the condition of the heater cables and the levers at the heater core itself prior to buying. If you can 'curb your enthusiasm' for just a few minutes find a good manual like Todd suggested and or the CD which is available and has good breakdowns for the various systems in your 'project'....