edelbrock heads and cam/rockers ?

I will be building a 5.0 roller motor for my 68 mustang,i have a pair of edelbrock heads for the 5.0 my questions are
1.what type of roller rockers should i use and what ratio.
2. Whats the best cam or highest lift i can go
3.do i need guide plates in the heads
The car will have a 5 speed and a 3:55 axle ratio and will be a street car
 
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