Classic Auto Air Clearance Problem

[FeSo4man]

Calling them tomorrow but posting here as well since I know several members have done this install- I’m adding the Classic Auto Air kit and am to the step of mounting the evap/heater box. When lined up with the mounting hole I drilled via the template, the drain tube doesn’t clear the bottom of the evap opening. The box is already as high as it can go before hitting the top of the firewall, and any lower and it will be on the firewall flange. What am I supposed to do here? The instructions mention “match drilling the drain tube” but doesn’t say what to drill (firewall or cover plate) and says it well after the evap installation steps. 
 

[420ponies]

You would think they would send you a template to make it fit the 1st time in the car..... 🤔 Hate when that happens! This is a non-A/C car ,correct?

Edited June 11 by 420ponies
added content

[jft69z]

1 hour ago, 420ponies said:

 This is a non-A/C car ,correct?

With that big rectangular window in the firewall, that would be a factory A/C car, Jim.

[FeSo4man]

Yep it is factory AC. Overall the instructions are better than some, but there are some things that are very vague and steps that are out of order. For example, according to the order of instructions both making clearance for the drain tube and attaching the sensing coil come AFTER mounting the evap... It's impossible to mount without first clearing the drain tube, and I'm glad I read ahead to see the sensing coil part because there's absolutely no way I could've done that with the evap already bolted in. I ended up calling them and they advised that I use the block off plate as a template and cut out the bottom of the opening to fit the drain tube. Ended up drilling as much as I could, using a cut off wheel to open it up and cleaning it all up with the Dremel, also had to bend the flange around the opening to give the nut clearance and drilled the bolt hole a 1/64 larger to get it to go in right. They could've easily put the drain tube on the same template as everything else but it's not even mentioned other than "match drilling". Again, could be a lot worse but I've had to do a lot more extra steps and mcguyvering than I would've hoped for a "drop in kit", and I haven't even started on mounting the condenser  🤦‍♂️