my mustang is a 98 and i think i was told on here that its a single port or something like that...i dont know lol but someone else said the big dif between a 98 and 99 is a split port i think and thats why they have 50+ hp to my model. from whati remember i think he said i can get it done and i dont have to do anything big like replace the block...if anyone knows whatim getting at please let me know what it is, how its done, and how much. or whats the dif that gives the 99+ model 50hp more then mine. that would be very much appreciated

 

i think you are looking for this
http://www.sn95forums.com/forum/index.php?topic=2837.0

dont know exactly whats involved

 

here found these in another thread on the same topic hopefully it helps

http://www.v6power.net/vb/showthread.php?t=5713
http://www.3.8mustang.com/forum/sho...split+port+swap
http://www.3.8mustang.com/forum/showthread.php?t=159544

 

hers a list of what you need


-97+ f-150 V6 heads or 99+ mustang v6 heads
-97+ f-150 v6 lower intake, or 99+ v6 mustang lower intake
-99+ mustang v6 upper intake
-99+ mustang EGR tube and valve (f-150 tube will work, but will need to be modified to clear the inlet for the vortech)
-TPS sensor for TB (1-CX-1488 from Ford) if not already on TB
-99+ TB
-Modified fuel rail that has a universal fuel pressure regulator, and a return line. (available from SteveC)
-Accelerator Bracket (F4SZ-9728-B) if not already included on upper intake
-Throttle cable from 99+ mustang v6
-99+ mustang v6 coil pack and wires
-99+ mustang intake tube, or any 99+ mustang CAI kit
-99+ mustang cooling hoses (including the ones going to the heater core) and pipes. You can also make your own lines, by using plumbing elbows,hoses and clamps, and fab it up yourself. note, if you use the 97+ f-150 lower, you'll have to fab it up yourself
-16 a.w.g automotive electrical wire
-teflon tape, pipe sealant, RTV
-head gaskets (i recommend 99+ mustang gaskets)
-upper and lower intake manifold gaskets.
TB gasket, 94-98 IAC gasket, 94-98 valve cover gaskets(reuse the 94-98 valve covers), exhaust header/manifold gaskets
-you can reuse the 94-98 headers
-use the 94-98 IAC since the 99+ IAC has a different connector
-rad fluid, oil, filter, new spark plugs
-JB weld (if you have a lower intake with the IMRC's since you need to remove them



found this list on another site thought it might help
im not a V6 guy but it all sounds correct