Chezterr,
Just putting the stock 3L valves in the svt head and widening the secondary intake port will most likely allow it to flow more than the stock 3.0 heads (though I have no flow data to back it up). If you bump up to 32mm exhausts, your limitation would now be focused towards the intake side. Since widening the passages on the intake secondary passages will help that, then you don't necessarily have go with 32mm exhausts. I am mainly suggesting that as an option since you already have them, and because you are shooting for 300hp. For 300hp you want to breath well at high rpm, and those bigger exhausts will help. You will be the first to attempt it if you go through with it, but I predict some good results with the right other mods.
As far as the tri-metal bearings: I defer to what Terry says about crank-whip as I have no knowledge about that. However, there are a good many more engines that have NOT failed to crank whip and oil starvation than there are that have. This is just to put the whole thing into perspective. If I were you, I'd go and buy the Cougar or Mondeo dual mode damper (aka harmonic balancer) that Terry recommends to prevent crank whip for a lot less money, and just use the standard bearings that you get for the long block. Then run a 1/2 court of oil over capacity to provide a bit more in the pan at high rpm.
Just my opinions.
warmonger
