[Ant]

KC built me an engine, which may not have much power below 4500rpm, this nascar based engine is 373 cuin and is dynoed at 675bhp at 7200rpm, the compression ratio is 10.3.1, with Yates alloy heads, on our BP 98 octane (your 92octane) and the timing back 2-3 degrees it should run fine on the road for cruising semi hard use etc.
The best thing to do is run some race fuel, 60/40 or 50/50 we have an airport 5 mins drive and they are happy to fill 44 gallon drums, as a friend has a fuel card, same price as normal fuel, plus the Porsche GT3 race guys run the Aussie NULON PRO fuel additive, you may have that available in the US, apparently this additive has been tested with other additives (and their crap claims), Nulon actually does improve the octane rating, so throw a good octane booster in with premium pump gas, the timing back slightly and there should be no problems.........food (fuel) for thought!!!!!!!!