Need help with cam choice Please!!!

[IKECHER]

newbie here. could really use some help.
have an 87 gt. stock short-block. vortec s/c 10lbs boost, underdrive pullies, hartman intake, 1-5/8 shorties,24lb injectors, 70mm mass air& t/b, t-rex pump,3.55 gears.......pushed out a head gasket (big shock). Putting on Edelbrock alum heads 1.90 valves, would like to do a cam swap.

1. can I do this with the block still in the car?
2. what size cam would be optimum?
3. what ratio roller rockers should I use?
4. best head gaskets?

Any help would be appreciated!!!!