I can't get the heater core back into my box with the amount I had to cut out for the big block. So I am going to run one of these Vintage Air heaters.
They are self contained under the dash.
http://www.google.com/search?sourceid=n ... a58296c9b1I will install two grommets into the modified cover and make it appear that a stock core is behind it. This can also be done with a flat panel and you will still have a heater and defrost.
BTW. The original link from Vintage Air would not pull up on this post, so I replaced it with the one above.