Don't think I have that connection; '77 looks different. I don't like that because the bent hose is so short and doesn't have the restrictor in it?
That short hose without restrictor would make it easy for oil mist to be sucked into the intake. I'd go for the right SC-hose with restrictor and connect it to the rear of the black boot. Then I'd plug the small nipple on the filler neck. Of course, another hose needs to go from breather cap to the nipple on the bulkhead.

I assume the '77 has this nipple?
Below is a picture of the filler neck etc. for SC's.
The nipple on the bulkhead next to the filler neck is for the hose going to the breather cap.
The nipple on the filler neck top is for a hose going to the black boot 90 deg Alu nipple. The hose contains the restrictor to prevent excessive oil mist going into the airbox!
__________________
1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD!
1995 seafoam-green 993 C2, LSD, Sport seats.

Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ".