Congratulations on your purchase and welcome to a great 914 site. I have a '71 914-6 too, #0372. Unfortunately my car does not have the original engine/transaxle. If my car did I would rebuild that stock linkage replacing all of the bushings, joints, etc. and learn to love the way it shifted.
Please make sure whomever you choose to work on your car knows them very well and is 100% trustworthy. If you have not already figured it out, this is a terrific site for 914 owners past, present and future. You will learn more about these cars on this site than you can imagine and the people here will keep you pointed in the right direction. Please feel free to post your thoughts, plans, questions, and concerns here for feedback. Lots of opinions, especially when it comes to original sixes. Some, (Pat, we love you) believe the cars should remain absolutely factory original and others believe it is your car, do as you wish. I started off in the middle really, and have since kind of migrated towards original restoration in large part because of my long-term exposure to Pat (not complaining BTW).
In short, my car will be restored and remain a stock bodied 914 with essentially slightly improved brakes and suspension with a stock 3.2 Motronic motor and 901 transaxle (from a six if I can find one). Patrick Motorsports is a great place to look and dream of what could and can be. I have personally been to their shops and believe me, their site is an accurate reflection of the work they do. Terrific guys and beautiful work, hands down. They definitely know our cars inside and out with no exceptions. If I hit the lotto (or my wife just said "OK") the first thing I would do is transport my car to Jim to have it completely restored. They are truly one-stop shopping for these cars. However they are not alone and you will find several reputable businesses out there offering complete services for these cars. Information is your best friend and this site has a ton of it.
And, please post pictures of your car and include your VIN. If you have not checked the VIN database on this site:
http://www.914world.com/bbs2/index.php?act=membervins to see if your car is listed or not please do. Add it if it is not listed so we have history on these rare cars.
Again, congratulations and welcome. I can't wait to see pictures of your car and learn about it.
Thanks for sharing too.