1992, you still have forged pistons with the 4 valve reliefs. You could go as large as .535-.540 lift, I'd suggest the E303 cam for a good overall improvement. The biggest cam you can get isn't always the best choice. This means you still have to take into account the rocker ratio you use, stick with the stock 1.6 ratio.
As for the rest of the mods you can do, I have to ask first what's the budget limit? That will ultimately determine what the best mods to do would be. But there's a lot better choices than 351 heads that are lighter weight too.
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