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You basically have two choices. Blacktop or Silvertop.
The silvertop is the earlier of the two. Aside from pistons, it basically has the same rotating assembly as the highcomp 4age. There is a slight variation in the intake runners from the early silvertops to the later silvertops accompanied by a slightly retuned ecu. All silvertop ecu's seem to be conservatively tuned and run an afm. Often times I like to use the blacktop ecu with the silvertop for its more aggressive top end tune.
The blacktop ran from 1995+. It ran 11:1 compression vs the 10.5:1 that the silvertop ran. The combustion chamber was also revised. This is the one thing that the silvertop had that is thought to be superior over the blacktop. Aside from this, the blacktop had larger itbs, intake ports, and exhaust ports. It also featured a much lightened rotating assembly. It had a lighter flywheel and rods. Even the cams seemed to be worked over to reduce weight.
The way prices are now, I'd go with a blacktop over a silvertop unless I couldn't find a blacktop, or found a killer deal on a nice silvertop (sub $300). With either one, I would run the blacktop ecu.
Of the swaps i've worked on, it is very possible to do this swap for under $1000.
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