small block heads

I used a thin layer of grease on the mateing surface of the head to hold the plexiglas to the head. What's the wd40 for?
Is it the one in your avatar picture? That's a swinger. They had two 2 door body styles in 75 a coupe (sport) and a 2 door hardtop (swinger) may be you got the wrong title? What is the first 4 of your vin number match it up with the first 4 on your title vin number!
we did that when i got it in 88 whit state troopers cause it had mississippi title