Well there isnt really a "kit" including everything. You can have ctracing build your engine and it comes with all that stuff. Or you can buy ebay sets that are a bunch of different brands of parts all sold togeather. I would suggest buying what you want individually. It always ends up cheaper in the long run that way. Honestly piston brand is all about preference. I have a wiseco. Gunna be putting a CP in on my next build. I have installed JE. Ross. Pro X. Namura. They are all ok. I would highly suggest a crf450 timing chain. And stud the head with either gt thunder hd studs or something similar. Dont buy into the ARP crap they sell for this motor. They dont do anything to solve the actual problem and thats the head studs pulling. Not stretching. I really like my magnum cam. But i have used hotcams. Webcams. Whitebrothers. And gt thunder. All are good. Dont go above .350 lift unless you plan to do shortened valve guides. Be sure to use a good mls head gasket. I like cometic. Havent used anything else and wont ever for that. Make sure when you get the cam you find out if they require hardfaced rocker arms. Also some require high rev springs. I like kibblewhite for those. I run them and have beat them hard without any problems. You will want to find a good engine machine shop for all the work. You can bore your stock sleeve to 87mm no problem. I wouldnt suggest going any further even though some do. Just seems sketchy thin at the bottom. The 87mm is thin enough to be alittle scary at first. But i have put my build through a copious amount of abuse and its held up no problem. Did my build coming up on 5 years ago and the stock crank has just decided to start letting loose. Thats why im switching to CP as they were the only ones who would make me a custom 87mm stroker piston. Welcome to the forums and keep us posted on what you decide to go with. And post up pictures along the way.
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