What diesel would be best?

I have a 77 Ford f250 I want to put a diesel engine and strong transmission in. What would be the best for towing and daily driver?

The 6.9 and 7.3 are both great for a daily and towing, 95 and newer were PowerStroke electronic injection diesels, more expensive to buy and fix.

There are tons of 7.3L Turbo Diesel IDI (pre-95) out there cheap and they are really great overall, get it with a ZF-5speed manual or a C6 3 speed automatic with a Gear Vendor Overdrive unit.

The E4OD was a good electronic tranny, but not really heavy duty and we usually switch it out with the C6 no electronic which needs no mods to do as the engine isn't electronic either pre -95.