You can use your driveshaft and clutch lnkage also.youll need to find motor mounts bellhousing,flywheel and probably front springs and exaust. You can even use your 351 distributor and radiator.
Great investment, i know what you mean about the concrete . Im about your age and christmas i helped one of my sons replace some cv joints and control arms on his car and was sore for a week.
http://www.redheadsteeringgears.com , http://www.powersteering.com ,are two good places that have good reputations. Another is http://www.agrperformance.com , they are in texas ,but i don't know what kind of work they do. Love the way your car sits.
You could make a drop base air cleaner, heres an article how to do it.its for a big block but their using a stealth intake with a ram air,might find something you can use .http://429mustangcougarinfo.50megs.com/stealth_aluminum_intake.htm
I did the mustang steve bearing on mine,i like it and it was easy to do.except for getting the support out.just takes the right combination of cuss words i guess.
I have the variable box and looking at the elbow or bend in the pitman arm, its about a 90 deg. move from lock to lock. Or from 8 o'clock to 5 o"clock at the end of the pitman arm looking from the front of the car.