That aftercooler setup is a good idea. A friend did a similar thing. I had a spare finned tube section that I gave him to use. Saw a video of a guy who welded up a 4 stage water to air condenser setup that probably worked awesome, but he spent days and $$ building it. It had two tubes inside a water jacket for each stage. Total overkill.

First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos []
Busting rust since the mid-60's