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My thoughts: Don't waste your time or money with the timing chain, absolutely not necassary unless you have 150K plus miles on the motor. Even if you do have that many miles, just replace with all stock parts. I had 80K miles on my block and made 412rwhp and 412rwtq at 30psi with Arias Pistons and Carillo rods. I ran the car at no less than 20psi but most of its life it was 25-30psi. I sold it after 9000 miles and its been an additional year of driving and still no problems. Duy in texas made 545rwhp on stock timing chain, stock head gasket, stock headbolts. I ran all of those components in my car stock as well. K.I.S.S. = Keep it simple, stupid. No need to oring your head or block, waste of time and money.
When building, go to the best machine shop, even if you have to drive out of your way for it. You want it done right and you shouldn't mind paying extra for it. Look into some sort of high performance rings. My stock 99 altima ones were half gone after 9000 miles. I was getting %50 leakdown readings which is not good. All you really need when building is a good set of forged pistons, forged rods, and some good rings, everything else will be fine stock. Another area to spend money in is engine management and tuning. Try stand alone of some sort and spend time on the dyno with an experienced tuner. If you are tuned correctly and safely you will have next to no problems. Make sure your rev limit is not higher than 7000rpms. The crank, and valvetrain will not support rev's any higher.
Replace all heater hoses, radiator hoses and clamps, and upgrade your radiator. Those were mistakes that cost me 2 headgaskets. Get an FSM! It will save you lots of time and money. As for fuel, if you are building a motor for boost, you would be much better off going with 740cc injectors. 550cc's will run out of fuel at about 360rwhp. And with forged internals and proper tuning, you should be way over that. Sard FPR is a good choice.
The KA has only been pushed as far as about 350rwhp on stock internals. If you dont plan on ever going over that, no need to build the motor. T.Y in AZ has been making over 300rwhp on his stock KA for 4 years now with tons of track events/drivers schools.
The KA-T is hands down way more fun to drive than the SR. Torque is an amazing feeling. My SR powered car has run a nearly identical time in the 1/4 mile but it doesnt feel nearly as fast.
If you have more questions, just ask.
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