[mr48chev]

One thought, if you have a bad heater core in your stock heater now or it has to have some other work it isn't financially prudent to buy a new heater core for one at today's costs and then replace it in a year or so. If it has the recirculating heater with the round core you are looking at well over 200 for a heater core and that goes a long way towards a complete unit.

If you have a working stock heater that doesn't leak and are looking at upgrading later that isn't an issue though.

Those hang under the dash AC units will get the inside of a truck cab just flat cold even in 100+ weather but if you ride with a passenger in the middle a lot they are knee bangers and the cold air blasts right on the passenger's legs. Had one that I transferred between two rigs and when I had it in my 59 ElCamino it would freeze us out in Central Texas in the summer time.