[84LX89GT]

I'm pretty much putting together the exact same combo you're doing, this is what i'm putting on:
have 1.7 roller rockers, 70mm Ford MAF, 70MM TB, TF street int. man., 1 5/8" uneq. headers, 2 1/2" exhaust, CAI, and installing GT40 heads, porting and gasket matching to intake and headers

What was recommended to me was a B-303 cam from a custom cam grinder after i gave him all the specs for my engine (he told me to use this rather than get a custom cam...he must know it works, since he willfully lost a sale recommending this cam). and it works awesome with 1.7 roller rockers. The specs are with 1.7 RR's:
.510 lift (max lift with pedestal rocker arms is ".512) with 284* total duration and 224* duration at .050" lift.
The power band with this cam is crazy from 4,000 to 6,000 with a NASTY sounding idle
If you go with something else, you may have to check valve to piston clearance. I'm going to check anyway, but this cam is about the largest you can put in without notching the pistons or converting to stud mount heads and rocker arms.