Hello Gene,
I have a 1975 P337G equipped with Air Cond., spoilers, gear door removal kit installed and inter coolers. All are well worth it if you can afford to do it. I love the a/c and spoilers. Cruise at 15,000 feet and when you want lower just hit the button and down you go at 400 f/m. No need to retard throttles, so shock cooling is not a worry. I do recommend inter coolers. Get a little more power with them.
Have any question send me an e-mail.
Jerrydesantis@hotmail.com
I. Owned N34EC about 20 years.
Cheers
Jerry