Hmmm, I vote no wing or curved wing, definitely not the straight wing ... unless you are actually trying to get some downforce, then the straight wing :)
A partial kit just popped up on Ebay: https://www.ebay.com/itm/1980-Replica-Kit-Makes-Other/392968167362
Looks like it's setup for RHD and missing the windscreen
I bought a used 360 drive-train for a similar project, make sure you check the lifters as they clog up quite easily and with 40 of them at $88 apiece it adds up quickly.