Sorry this reply is very late, but I've only just signed up!
I converted my 1974 FLH Police Special back to the original factory hand-shift set-up last year, with no advice available on how to do it, so you might gain from my mistakes.
I used a mixture of the V-Twin kit (J&P Cycles part 600-024) and old used OEM parts. Incidentally, V-Twin actually made the Shovelhead hand-shift parts for HD, so shouldn't really be thought of as reproductions.
If you intend to run a stock ratchet-top tranny, you'll need a smooth lever gate as supplied by V-Twin 601-818, but I don't like the ratchet top (too many parts to go wrong...) so got a good OEM 1965 hand shift top from eBay, which needs a notched 1-N-2-3-4 shifter lever gate. Most 4-speed Knuckle or Pan hand-shift tranny lids will fit straight on, but note that your ratchet-style cast shifter drum will not fit into the hand-shift tranny top - you'll need the steel hand-shift drum from the older models. Later hand-shift tranny tops (like my 1965) have a hole threaded for a neutral switch, but it is possible to tap a thread into an older top - I've done that in the past as well. If you want a neutral switch, you'll need the ratchet-tops shifter gear, which has a little cam lobe to actuate the switch.
One part I wouldn't buy from V-Twin is their chrome hand-shift lever - it doesn't even come close to clearing stock 5-gallon tanks, and must be for the smaller optional 3 gallon ones. Good OEM levers often come up, so look for part 33676-66, which has really beautiful, subtle curves which are almost impossible to recreate.
To complete the tranny top, you'll need a new release arm, part 37052-65 (J&P's 6200245).
The rocker clutch has to be a late model, incorporating a stud on the pedal to retain rod lever 36816-65A, otherwise it's identical to earlier rocker clutches. If you have a stock alloy primary cover from the post-alternator era, you'll need to space the rocker clutch out from the frame using alloy spacer block 36869-70 - this is a fairly scarce OEM part, but J&P's V-Twin item 630-279 is only around $23.
Keep a good stock of spare shift lever springs (33865-65) and clutch friction discs ((36899-41).
For a clutch rod I used J&P's 630-461 (36918-65) and rod end 36916-52. I used a straight hand-shift rod with threaded ends, with a single-eye rod end for the tranny, and a clevis on the shift-lever end to eliminate linkage slop.
Because the rocker clutch assembly has been spaced further out, the front left footboard bracket will also need spaced using a combination of a thick washer and a short footboard stud (50657-70A, V-Twin 27-0636) usually found on the right hand footboard where it comes out of the rear master cylinder, and the stock jiffy stand will need a lowering wedge between the jiffy bracket and the rocker clutch bracket, V-Twin 31-0215, otherwise the bike will sit too upright for safety when parked due to the stand being further out from the machine's centerline.
If you need any more advice or information, like photos, HD part numbers and assembly drawings, original handbook Shovel hand-shift or rocker clutch adjustment instructions, just email me at email@example.com
Regards and good luck!