70 dart windshield instal how to do

I have a ? for any one who has intsaled a 70 dart windsheild i had mine put in 20 plus years ago by a buddy i thought, he put it in with roofing jack cement i think that was wrong yea.yea any how ive seen books that show a window gasket plus some type of rubber filler strip that goes along the bottom of the window does this sound correct ,ho yea it leaked like **** and ow i have some floor and dash repairs thanks buddy ford guy what can i do any helpfull info would be superbad thankz:dontknow: