Phenolic Carb Spacer

Hello, I am looking to run a 4 hole tapered spacer on my 470 and had a question for the group in regards to phenolic vs aluminum carb spacers. I was looking at a Jegs phenolic spacer that says it is good with temperatures up to 400 degrees, which seems to be pretty high. This is going on a street motor that will get driven fairly regularly in the summer and my only concern is that I read a number of articles which mention phenolic spacers warping and causing vacuum leaks. (i'm guessing that is why they make aluminum spacers) Does anyone have experience with a phenolic spacer in a street application? If so, have you had any issues with it and would you recommend running it or and aluminum spacer?