Well since your in drayton, your local ford does great work.
Now they don't offer performance modifications due to being a dealer.
However if you supplied the parts or requested the items and signed a waver I'm sure there would be no issues. Ford parts and labor are covered for 2 years unlimited milage. Now if you had studs with ford gaskets then that coverage would not apply as only ford parts would be covered.
Really depends how far you want to go. If your doing studs, I'd throw in new lifters, if you don't like changing oil then rocker arms. My truck has 260+km and rockers look great, so maintenance is the key vs the little but expensive things that add up.
They also deal with nadp if you need a trans, or wait till it pops.
Dirty diesel also has their own 71/59 turbos, if your thinking that route