You will HATE the results...
The oval port manifold ports are abyssmally tiny compared to even a stock 2.5L split port manifold. (Power above 4k will suffer.)
The oval port cams DO NOT have different cam profiles to raise both low and high range power. (The entire powerband will suffer)
The oval ports cams have 12-18 degrees less duration then the stock 2.5L split port cams. (I.E. drops even yet more power)
{sidenote}
Funny thing about that is the oval port cams are "rated" at 232 duration or the same as the level 3 Cat Cams. Matter of fact the level 3 Cat Cams have the exact same valve timing points listed as the 3L oval port cams. hmmm...

Be interesting to actually compare the two cams... Maybe finding my degree wheel is in order...

{/sidenote}
That's 3 strikes and I have just started. You need to forget this idea and actually do some homework and research on this subject A LOT.