I've got a 94 5.0 in my 67 and I,m using a carb set up. A small freeze plug is included in the package when you buy a new old style timing cover, at least mine did, it came from National Parts Depot. You will need to get a fuel pump drive eccentric to mount on the camshaft, as previously mentioned. There are two types a one piece and a two piece. Either one will work, but I prefer the one piece. The dowel pin that is located at the end of the camshaft must engage the eccentric or else it will spin and cause the sprocket bolt to back off. Make sure that it's long enough. The original 5.0 dowel isn't because it didn't have an eccentric to drive. I'm using an electric fuel pump, but included the provision for the mechanical pump while I was changing timing covers, in case I change my mind. In addition:
1. You need a front sump oil pan.
2. Front sump timing cover.
3. A pulley for the 4 bolt 50 oz harmonic balancer. (1970 & up pulleys have 4 bolts)
4. 50 oz balance flywheel
5. Thermactor plugs for the open ports at the rear of the cyl. heads (use tapered end, female Allen head set screws for plugs, 5/8"x11)
6. Standard rotation water pump, stock cast iron or aftermarket aluminum. The pump with the inlet on the passenger side, (pre 1970), should be used to clear the timing pointer on the timing cover.
7.Front sump oil pump pick up.
8. Distributor with a vacuum advance (preferably one with the large dist cap, if using a stock unit) I can't remember the year that works, but I think someone will come up with it. I'm using a Mallory myself.
9. Steel dist drive gear, for use with roller cam.
10. Timing tape for harmonic balancer( balancer has to be remarked to correspond with the different location of the timing pointer on the old style cover.
11. Bracket for clutch equilizer. The threaded bolt hole for the equalizer is no longer there. ( there are several aftermarket sources for the bracket )
12. A late model starter for manual
trans. (It's smaller and lighter in weight.) The OE Ford starter for the Mustang 5.0 w/man
trans is fine.
13.If you go to an electric fuel pump, remember that most of them make noise and you have to cap off the mechanical pump mount on the timing cover. If you go mechanical, any pump for a small block Ford will work.
14. The 8 inch rear end will be at its limit around 300 HP (Engine) adjust accordingly.
15. 1968 motor mounts work
As for the T5 install I'm sure someone will have some info, but the
trans crossmember, I believe, needs to be changed.
I hope this info helps. I had to find out alot about this 5.0 swap stuff on my own, as I installed mine several years ago when people had just started putting the late model engines in vintage Mustangs. Good info was hard to come by. Good luck.
Installing 5.0 carb engine and T5 tranny in 1968 Mustang coupe 
