HVAC issues

Hi everyone, I have a 1970 Duster 318 in which I just got the vent controls working. When I got the car the controls didn't work, and there was a simple on/off switch hotwired to the fan that didn't work either. I found a replacement control box on eBay, and I hooked it up so it will mostly work. I now have heat, and I manually changed the vents so I always have heat blowing out the top vents. Now, I have three problems. One, the heat isn't very strong and in cold weather the inside of the car never seems to heat up. Would this be because I have no headliner, old weatherstripping, and no driver's side door panel? How can I make it hotter? My second problem is with the A/C. I don't know the last time it was used, and I want to know if I should rebuild the compressor before I hook up the wiring or just recharge it and go. My third problem is with the control box; the old box that was in the dash when I got the car was a white box that had two selector "levers", one for the mode (heat, A/C, etc.) and one for the temperature control. Then on the side it has a vertical selector lever for the fan speed. I want to know how exactly the vacuum lines should be hooked up, and if there is a way to get the bezel for it and screw it in correctly to the dash.