If it's aboe 45, plug the vac line to the Thermac door to keep the hot air OFF.
I seem to remember that TBI trucks used only thermostatic control for Thermac but maybe some years did, some didn't? ND will be similar to MT in that icing will be a problem, esp. driving on highway and keeping warm air is critical to prevent this. Switching to non-heated intake can make more power but driveability can suffer without tuning to make up for the wider range of typical operating variabes. I've found nice gains for stock or mild trucks using low end towing type cams. Overall power may not increase but you'll have more power and torque in the portion of the power band used most often. '95 block might be provisioned for factory roller cam. For the power hungry it's worth knowing that Whipple once offered (and may still offer) a supercharger kit for TBI 7.4 engines.