I did first time around in the 80s, changing a 1300 to a type 4 injection from a 411 (think you had to use a type 3 clutch driven plate) It was great for about a year then gremlins attacked the electronics. Didn't know enough to sort it out, changed to carbs because they were easy to come by in scrapyards back then - it still wasn't very happy. Finally changed it back to a Beetle engine from a friends buggy before eventually selling the car in about 87.