My truck is a 1964 F250 and is in good shape and completely stock. The engine runs well however I don't know for sure if it has ever been rebuilt.  My question has to do with engine modifications to gain HP and torque so that I may pull my camp trailer better which weighs around 3,200 lbs dry. 

1.)  Which modifications can I make now to up the HP and torque without a total rebuild?  Dual exhaust?  Electronic ignition?

2.)  When I do decide to rebuild which modifications would you all recommend?  I'm looking for at least 350 ft/lbs torque and around 300 HP.  Can this be done with a 292 Y block?  I'm looking to spend around $4000 TO $5000 for the engine rebuild, (less if I can but I know it isn't cheap.).

I'm serious about fixing up this truck.  So far I have replaced the clutch, rebuilt the front suspension and steering, new brakes all around, new wheel bearings, new carpet, anti rattle kit for the doors, new stereo and speakers, new seat, rebuilt the entire heating system, added a new bump steer kit to the front axle, and have purchased a new one wire alternator to replace the generator (which I haven't bolted on yet). I still have work to do but it's getting better all the time!

1964 F250

http://ironclad.shutterfly.com/51