Hi everybody. Have a question for Swap from Russia

[DinoBocharov]

Hi, everybody. I Write to you from far Russia. Where too love powerful American cars. Your forum much looked, but all the same there are questions. Forgive, if I write a little unclear. Your help is necessary to me.
At me is caprice 1992, with alteration from TBI in the carburetor Holley 8105. Everything suits me, but it is necessary to move further. Now I will put 5,3 (Vortec 297 horsepowerfrom Silverado) and here this system http://www.jegs.com/p/Edelbrock/Edel...55239/10002/-1 + the carburetor http://www.jegs.com/i/Edelbrock/350/1406/10002/-1.
I have a question:
1. Can leave I the old gearbox 4L60?
2. It is necessary to put an external gasoline pump?
3. What will be necessary even at alteration?
4.here spoke about flexplate ($ ~49). For what it is necessary and where it to put?
5.If nevertheless to put a box 4L60е, how to be with tranny?
Thank you all for your responses.
Dino.