98 Disco I SE7 rebuild

[sunshineking]

New to forum, Happy Holidays to everybody here!!!!

Bought this 1998 Disco SE7 about 2 months ago with 118k on board and a blown head gasket.
This car runs hot and the only way to keep it from overheating when you drive it is to turn the heat on to max inside.Oil leaks from the front cover , side of the cyl heads and oil pan so decided to do a head gasket job.
I have a few questions for the guys who have done this b4..
I called a local machine shop to have the heads resurfaced and valve job done, picked up 16 valve seals from local dealer but 8 are in green and the other 8 in blue color..they all look the same to me
Q1: are the valve seals the same for the exhaust and intake valves?

Q2: In the manual is specified the use of special tool LRT-12-090 for the installation of front cover,can I do it without this tool? if not where can I get one?

Q3:front cover gasket is supposed to be coated with hylosil sealant b4 installation according to the manual..is this correct when installing a new gasket?

Q4:For oil pan gasket use hylosil sealant or normal oil pan gasket like the one available at roverpartsdotcom?

any help and suggestion will be appreciated