If you are looking for used ones you do not want the Djet connectors, the LJet and later are great.
(DJet pin/socket design was a first try, the design was later fixed)
Pretty common connector, but I suggest modern injectors, they have come a long way in the last 40+ years.
The original injectors were lowZ and need either the resistor pack or PWM current limiting, which the MS can do if built right.
Again, think "upgrade" the Vanagon injectors and many Volvo etc and even Japanese injectors were EV1s and will drop right in, are highZ and have far better spray patterns. (and aren't 45 years old)
If memory serves its called an EV1 connector, available with pigtails or with pins to crimp thyself.
You want the late style with the little exposed wire hoops you squeeze to release the lock.
The early style were a total PITA to deal with.
I strongly suggest getting a good ratcheting crimper and if you use pigtails or slice wires, get a box of 50 of the heat shrink/hot melt glue sealed butt splices and other connectors. I have a Paladin 8000 frame and a variety of die.
The 1300 frame is OK but sucks to use ergonomically IMHO, YMMV.
Best deal is to buy a combo frame with a die you will use, f-type or the uninsulated die are good choices.
I use the "uninsulated" die with the dimplers for the heat shrink sealed crimps, as they are too small OD for the "insulated" die, which expect much thicker plastic. (won't grab 20 ga wire in them otherwise)
The pins will require the right die: they are F types, GM Metripak IIRC are very similar.
Suggest a stand-lone crimper for those, they can be had pretty cheap, even the Delco one.
As to the regulator, the DJet regulator works awesome, they sell them with a vacuum port even at Jegs and Summit, MSD brand, is a Bosch DJet regulator right part# and all, can probably find them cheaper elsewhere. MSD Part# 2222.
If you don't want to pay the stupid tax you can buy them in a variety of port configuration from autohausaz for Mercedes/BMW etc without the vac port for far less, I personally don't use the vac reference, not really needed with reasonably sized injectors on a NA motor.
...or you can buy this one on ebay with free shipping:
http://www.ebay.com/itm/Porsche-914-4-F ... 51&vxp=mtr