03 gt vs 95 cobra

Port the stock lower, throw on some (take your pick) aluminum heads, or port the stock GT40's, cam, blower, tune. You meet your requirements and have a very stout and reliable combo.

I also second the idea of doing a pretty straight forward HCI...or just porting the stock H/I. Throw an S trim or Novi on there...get a safe tune and call it a day!

Both of your cars can handle 450HP no problem. More like 450RWHP!!! Safe tune and good gas is all you need. I have been trouble free for 10,000 supercharged miles.

95 Cobra. I would buy a nice Edelbrock H/C/I package. Good headers, Prochamber H-pipe, an Flowmaster cat-back exhaust. This car will sound awesome!! In the future, I would suggest a Vortech S-trim with 8-10 pounds of boost and see where you stand. If you want more, go with 12-14 lbs and a good methanol injection kit to cool inlet temps and add increase octane so you don't have to run race gas.

03 GT. Looks like your GT runs good already, I didn't read you entire sig, just your 13.38 time. That is pretty fast for a midly modded 2V.

Either one could do it...

One car is older and one is newer...

An aftermarket block cost more than aftermarket internals...