I currently have my engine apart after it ate the lobes a few months ago. I am going with a roller set up as soon as I have the cash. I have chated a bit with other members and there has been some discussions on this topic.
From what I have gathered gains can be as much as 50-60hp more provided you have supporting mods such as good flowing heads, valves, exhaust, etc...
I would expect to gain a minimun of 20hp going to a roller mainly from less fricyion and plus a better and faster ramp on the cam grind will lead to a faster spool.
I can not yet speak from exsperience but you will get a gain it's just a matter of how much. I am not going to a roller for more power, my car made plenty with a flat tappet and I was very happy with it. I have been through 3 flat tappet cams and frankly I am done!!! no more I am going to wait until next year if I have to just to have a roller and not have to worry about wippig another cam.
Good luck 
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'87 GN stock block and bore, forged pistons, stock rods with ARP rob bolts and RJC girdle. Stock heads with full port and polish, stock intake full port and polish. 63mm TB, Reed cam flattappet Hydrolic 223/223 /502/502 @ 0.050, 55# injectors custome burn chip, TE 66, Dual walbro 340 with hotwire kit, ATR headers, 3" TH down pipe, 1 1/2 with large neck stock location I/C, Dual 2 3/4" exhaust with dynomax race bullets. 3.5" LS1 MAF with translator, Big mouth CAI, Art carr 9" 3000 stall converter, 200R4 with all pgraded parts, stock rear, upper and lower southside rear control arms, Eibach springs, comp shocks 90/10 in front 50/50 in rear. Airbags & drag radials.
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