Man that engine bay looks alot newer than 79. Blower motor resistor looks newerish to me to. Every thing is original, I have owned the van since it was 7 months old.
But I see the obvious difference in the upper line where she goes into the drier/accumulator. 1978 & 1979 were the same, all other years are different, parts suppliers (all of them) never got the memo.
Is the lower line ran similar to these pictured? Yes, they very may well be identical.
I got none of my login credentials to look at stuff here at home so I'll definitely check for you monday when I get in. But definitely 79 and definitely a 350? Definitely.
Just confirm for me 4 seasons part # 54538 is definitely NOT what you need and potentially what you already may have. Correct, everyone wants to sell me that style.
or this dude
1980-1984 Chevrolet G20 A/C Evaporator - Autopart Premium APAEC418 - Front - PartsGeek.com Note that there is an ad at the bottom of the page that should be the same, you just cannot trust drawings or photos unless they are the actual part for sale, good luck having anyone sending an actual photo. A large wholesaler of radiators and A/C parts had a drawing of the exact part I need, when I got it the part was the same junk everyone else was selling. There are about 5 clowns located in Hebron, Kentucky selling the same from different store fronts using a generic picture.
Thank you for making this effort, I am at my wits end trying to keep this van in original condition.