I ran the Del West Titaniums in Pontiac heads with 9.0:1 and had some problems with exhausts. Del West advised not to use them on the exhuast due to the hotter burn of the lower compression. Left the intakes in and changed the exhaust to the Ferra Super Alloys and life was good.

I'd also be interested in knowing about the titanium rods. Anyone else know anything?

Ti rods work to a point. They are strong and light, but have a finite life cycle.
Unlike aluminum rods, which will stretch during use and can be measured to predict the life cycle, Ti rods will not stretch, but will become brittle over time. this is difficult if not impossible to measure.
Usually your only idea that a ti rod is beyond it's limits is when it is sticking through the side of the block.
Therefore, you must wiegh other's experience and your best guess to determine replacement time.
In hours and hours upon more hours of dyno time, Pro Stock builders do not find a significant performance (ie-accelaration) advantage with Ti rods. They do last twice as long as aluminum, but are twice the price.
The above is on 500" motors. For IHRA stuff (813ci) the strength of Ti rods on such a long stroke, high RPM motor justifies Ti rods.
In a street application, Ti rods would last a long time I would think.

Now, Ti valve springs....that's another story. They are junk. They never get weak, but they break without losing seat pressure, once again, very unpredictable.

Ti valves, I have no idea in a marine environment. They are the ONLY valves used in high rpm race appications.

500 ci, 9800 RPM, Many, many laps, and never had a valve failure.