Can i use this intake with this rusty surface?with gasket sealer?(pic inside)

[73gmc1082]

Hi i have a question the only intake i can find at a wrecker in my province without spending like 400 on a edelbrock was this one,i have been searching with no luck for a replacement,,, it has some rust/pitting issues on the surface under the egr side, i was wondering if i clean it up real nice with a very fine grit sandpaper and then use that permatex ultra copper max temp gasket sealer thats good for like 600f with a putty knife and fill in the divits,this engine uses a metal valley pan instead of 2 long gaskets, if i make it flush it should seal until i find a replacement later on? any thoughts or opinions would be greatly valued,* i understand i should replace it, but do you think my divit fill in would do the trick for now? other side is shiny smooth)
thankyou for taking a look