ya i wasn't sure of the location of iat sensor on his motor, but my overall point is what i stated later, the temperature drop is from the hose bypassing not gaskets.

you can spend a lot of money and waste a lot of time protecting your intake manifold from conductive heat transfers, there's still a hood trapping heat in, cf hood = $$ and there's also other ways of cooling, better radiator, better fans, shrouds, sheilds.

losircity if i was put in your situation, i would bypass my throttle body at most and get a colder thermostat, total cost $12 thermostat, $8.99 for 1gal of anti-freeze, and throw in a $5 miscellaneous hose and clamps for the bypass LOL.