Transmission blew last week ...so what a treat time to go ahead and take out the motor in order to get to all my leaky gaskets!

I have read helpful posts about lining the firewall on the interior with peal n seal roofing material. Is there anything recommended to put on the firewall..engine side...to reduce heat? Instead of this product, is there a spray on product to reduce heat? Any info appreciated.

Also, I was at auto zone and saw header insulation wrap to reduce heat (50 bucks). Any experience here with this product?

Tks. Toby