A/C to non A/C change

I will try to justify my intentions. When I purchased the car it was a 1/8 mile drag car that had a 383 in it. It was born a 318 car and all of the a/c components were long gone and all of the vacuum lines under the hood that would have operated the a/c underdash components were mia also. My current plan is to basically make a 340 4 sp clone to an extent and I did think about an after market a/c unit but reality set in as far as cost and not to mention keeping my 340 cool as it is at .060 over. The current a/c heater box is not in great shape either to the extent that I probably won't be able the get the seams joined to seal them.