When you use the vtec oil and water pumps you have to run a GSR timing belt as well.
The vtec water pump has 22 teeth versus the 18 teeth the LS has..
Golden Eagle has one of the best and most complete kits out there. I'm building an LS/VTEC myself, I just ordered this kit and this is what my build consists of..
GSR head
Head has been milled
Peak Performance Stage 2 cams and cam gears
Skunk 2 valvetrain
Skunk 2 intake manifold
Accel 310cc injectors
GSR water pump
GSR oil pump
GSR timing belt
GSR distributor
B18B1 bottem end
PR3 pistons
Shotpeened LS rods
All ARP hardware
ACL bearings
In my opinion, to build a RELIABLE LS/VTEC then you must at least use ARP headstuds and rod bolts, ACL bearings, and it's a good idea to get the LS rods shotpeened to make them stronger. LS bottem ends do not like to rev high, your prolly gonna be making power 8000+ so your definently going to want to take your time, and do everything right so you don't spin a bearing or worse.
Do some research, there are quite a few good LS/VTEC and B20/VTEC write ups on Honda-Tech.