When I decided
Ak Miller, drag200stang, does10's and
Lincs200 had it right because they used low mount starter engines, and everything became simple as a result.
Its even simpler if you use a Code 5(67), L (68-79) or C code (80 to 81) 250 six from 67 to 81, and even better than heaven on a stick when you have a 4.25" foot ball converter cast iron header. Turbo installations aren't any more simple than these.
Lincs 200 didn't use this exhast because he's a competeant welder, and in his experience, the 2.125" standard exhast was easy enough to hook a J tube to. I'd say the 4.25 four bolter is even easier.
For me, this is the only combination to use, low mout or high, the late 1980 onwards exhast was a specifc change for the i6. And Ford wouldn't have changed it for no reason.
With room to move, room for an alternator, starter and big ass Tecumseh/York/Motorcraft a/c pump, look how simple the C code exhast turbo adaptor is!