My old ITC Honda presented the same dilemma. A/C cars had the condenser beside the radiator; non-A/C cars had a bolted-in block-off plate. I just took the plate off one of my non A/C parts cars and put it on the race car. The sourcing of the air was not a problem, because it originally came from the left-side headlight surround. I just "upgraded" the original, and left it at that. Besides - how much air does it take to run 65 WHP??