Rob at Amazon seems to be commenting from a rallying perspective. In the United States we don't have much opportunity to run European style rallies, but we can get out vintage cars out onto the racetrack.
I race a '59 MGA, and I have delusions about getting the PV444 out on track as well.
On the racetrack, the object is to run wide open throttle, so the power band on my MGA camshaft is 3,500 to 7,000 rpms. On that car, the exhaust gasses hit a wall just behind the valve head, and porting the head is very beneficial. I think that would also be the case for a street engine, although the porting wouldn't need to be quite so aggressive.
I have a B16 in my Volvo. When I first got it tuned, I noticed that it had a huge amount of carbon build-up in the combustion chamber. I've been running it lean in the hopes of burning off some of that stuff. But one of these days, I'll pull the head and have a look.
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