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Which cam are you going to run? Roller or flat tappet? The heads are available with all sorts of valve spring combinations.
A rail rocker is considered a pedestal mount rocker arm, like the factory 5.0 engines had. The rocker arm is just bolted/torqued down to the head, without the use of a guideplate and rocker stud.
I just built a 347 a few months back with AFR 185cc heads and a very mild solid roller cam that made 490hp with an undersized carburetor. The AFR heads are very good heads. I hate to go over about 500hp without a lot of block prep (main girdle, studs, etc) because the biggest weakness here is the factory block.
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