BHAM, about the comment on overly big heads and valves, and using a small cam.

There is an advantage to this. Valvetrain stress being the most important.

I have such a set-up and I am very happy with the results.

My 200 CC 2.05 heads, with a small .5 inch lift and 226 duration, has a lot less valve train stress then a 1.94 185 cc head, with a .550 lift and 240 durration cam. I can spin this motor up to 7000 RPM's and must limit it there, because the connecting rods I used will not take the stress. Put pulls hard in every gear to that RPM, though I choose to shift near 6400 RPM's for best results.

The advantage of large heads and small cam are: a lot less spring seat and opening pressure, (saves HP loss) less lift means less dynamic momentum pressure, less effort on the pushrods to open the valves, resulting in less pushrod deflection, (means the valves actually open to spec)and my engine is more efficent (loosing less HP) the lifters track the cam lobes better, since the dynamics actions are reduced. Less chance of valve float. The cam grind is also fatter on the sides of the lobes, since the lift is less. This means more average flow then just a really good peak flow on a higher lift cam. Big 200 CC runners take advantage of this effect.

One very important cam spec that no one talks about, is the rate of valve opening. On flat tappet cams, the rate is always faster then a roller cam, but the roller cam has better peak opening then a flat tappet. This is one reason why the cams are not interchangable.

A faster rate of opening, establishes a better partial lift air flow throughout the valve opening/closing operation. Higher lift Flat tappet cams will have a lesser opening/closing rate, since the lobes are much taller.

I port matched my heads to my manifold, took some ridges out from the casting mistakes, my cam was custom ground by a good friend to match the heads I am using.

Just the fact that you removed the valve guide bosses tells me a lot. That is a great way to build short life heads. You can not get the heat out of the valve without those bosses, especially the exhaust valve, you will burn those valves really quick. The valve guide is short enough as it is, taking another 3/8 off of them is bad news. The valves will also start to deflect at high RPM's reducing HP and seating of the valves at high RPM's. Polish does very little, except eye-candy.

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What is life worth, if everything comes easy...?
66 Stang 385+ HP 306 .494 /.520 225 durr @.05, 200cc Windsor Sr's, Edle RPM, C4, 3.00 posi, 575 Annular Mighty Demon, 22 MPG,