Draco
I live just outside of Montreal so you are only about 2 hours away. Come by any time, just contact me first to make sure I will be home. The car is all apart right now so don't expect me to be able to fire it up. I go to the F1 race every year in June, I think the CART race is scheduled for September.
The main reason that I went with the Performer RPM was that the Airgap was only available for Chevies when I bought mine. The airgap for the 351W came out about a year later. I have been thinking about changing for an Airgap but I had other upgrades higher on the priority list.
Overall engine height can be a potential problem with these cars. I bought a beautiful cast aluminium oval air filter from Finish Line only to find out that I couldn't make it fit without making some serious modifications to the hood and/or the filter. Paula was very understanding and took it back and supplied me with a much smaller round chrome filter that fits quite nicely.
Wayne