Join Date: Jan 2003
Location: Merrillville, IN
yes 136K is alomst stupid to do any mods on a stock 3.8. If I were you and only had 1000$ to work with.
I would find a 98 or newer 4.2L F-150 low mileage engine, you can simply from there get a 99-03 Mustang upper intake W/ throttle body and then pretty much bolt the whole thing in.
you can find the motors with around 60-85K on the clock for around $750 goto Car-Parts.com or check out LKQ.com for local places.
You will still need misc stuff like heater hose and possible extend the fuel lines but its almost a straight bolt up deal.
Plus,, even with all the mods you listed you wouldnt achieve the power/tq of the stock 4.2L