Heat Insulator Needed?

[palerider94]

I've got a 289 performer edelbrock with a 3/4 spacer that a holley 600 sits on. There is also a 3/8 " heat insulator that sits between spacer and and manifold. Is it necessary to run a heat instulator when using a spacer between the carb and manifold. I'm currently fixing and intake gasket leak and was wondering I need to put heat insulator on - current one is shot. Appreciate any feedback. thanks

 

[2nd Mustang]

I have an older Edelbrock Streetmaster single plane intake and a new Holley 600 with just the gasket supplied with the carb. No trouble issues.