heat shield for my slant six!! HELP

I talked to one of the reps from the cool carb company at a national show. He told me he didn't recommend for the /6 because the core material had melted on some /6 users. Their website includes the following.

"This product is not recommended for the use on: 1. Intakes with heat crossovers and EGR values in the intake. 2. Straight 4-6-8 cylinder motors where the exhaust and intake overlap. 3. Some castiron intakes have had an issue also. REASON: The polycore is an excellent insulation but it cannot take the extreme heat that the exhaust creates. This causes it to get soft or melt."