Carb Spacer? Edelbrock w/ 318

I used a 1/2" one on a 318 that I have in my '65 Barracuda with the same carb. My car was vapor locking last summer when I first bought it & the spacer seems to be one of the main reasons that I have been able to control the vapor lock. They also supposedly improve performance. I got mine from Jegs: http://www.jegs.com/i/Edelbrock/350/8724/10002/-1
If clearance is an issue you can buy drop down air cleaners like this: http://www.jegs.com/i/K&N/599/85-3549/10002/-1