SAE80 - RedLine MTL is usually recommended.
Your car will be '87? Your on a boundary on what gearbox (if even original) it will have. With the car level, the earlier models need filling until the filler hole overflows, then a further 0.5L adding (usually via the speedo cable hole).
Later models had the filler hole moved up about 7mm to correct this.
2L is what you should be putting in regardless of box vers.