Good luck with your project & if you get it up & running I am sure that you will not regret it . The official end date for the 594 ccs motor was 1976 but your one could have been registered later. Subscribing to the club to get membership is a good idea as it will help you get very cheap classic car insurance as well as the online manual. I do like to have a hard copy of the haynes manual close to hand & the early one, 73 to 76 cars, often sell for 99p plus postage on eBay [-/