rebuilding and upgrading my 5.7 vortec , advice?

[lord humungus]

normaly i read other peoples stories and pick up a bit here and there but this time its important, and alot of you guys seem pretty knowledgable , my intake leaked like a steam pot and ive had to move the truck a few times and ran it till the tempature rose almost to high . had to jump start it a couple of times and now it seems like the timing is weird before starting it turns fast then slow then fast and so on until it starts , id like to just replace the motor , it has over 250000 miles but money is funny, so im gonna have to do it piece by piece,,,,, i need advice , tips , who makes the best rebuild kits , what upgrades can i do, any and all help would b hot ,,,, the familys work horse needs help . i thank you very much now give me your brains lol

[lord humungus]

Never mind , New question, I bought this suburban today for the motor , so that's no longer a problem , ... Can I take parts off the 98 3/4 hd suburban 4x4 and bolt them on my 96 3/4 hd ext cab 2x4 and make it 4x4 and make the suburban a 2x4 ?

[lord humungus]

could anyone reading this tell me where to post questions about any of this stuff,