you can buy my 4.6
Gen 1 is "faster" I think, ( the one i have 93 mark ) the intake manifold is good design.
alls i was going to do is get the FR500 cam kit ( comes with valves but found out the guides are different from 93 b series heads to say a 96 cobra b series head )
and get the stock B-series heads ported.
this and a couple of other simple things would have made 380-400 hp on motor.
then get a cobra rotating mass for strength and get a KB twin screw
you might as well start with a 4.6 dohc though. This aluminum Teksid block is STRONG AS ~~~~. and it only weighs 84 pounds. the bottom end is not "strong" per-se where you could run the same power through it as an 03 cobra, but I dont see 500 hp blowing any main bearings or cracking rods with out excessive abuse.. ( however the rods in the lincoln applications are weak ) but I have everything, the engine is actually bolted to the K member right now, i have the DIS module and EEC-IV computer and the entire wiring harness. but thats the best alternative, there are people who do the newer 03 cobra dohc swap, but i bet they took a serious bruising in their wallet. If you talk to "Racecougar" or "4cambird" over at TCCOA about dohc swapping they can tell you basically everything you need to know about putting a 4 cam mod motor in your MN12.
but IMO i would get a Gen 1 4.6 dohc, ( i can sell you mine for a decent amount ) port those B series heads, get new cams, and MAYBE a 96-98 cobra intake manifold, and kooks headers, you will be all set.
or get crazy and make it a 5.0 stroker so you have a forged bottom end.
just my long-winded 5 cents.
PS careful about talking that swap here, most guys are open here, whereas others will stone you to death for ditching the 3.8
if you want SOHC performance talk to big "forgot his name" the guy who owns "frankencougie" he can build some SERIOUS PI motors.
but so long as it sports a blower, its still a Thunderbird SC to me even if its a big block