The S5003 rockers are for A/M heads with non-stock diameter springs. The other sets are for setups such as Batten/Bulldog heads, or if you want to continue use of pedestal mount, or are using a 5/16" bolt. The funny thing is someone just released shaft mounted rockers for the BBO, like a Jesel system but not by them, and I already have these, damn.
I won't lift engines with carb plates, too dangerous, I use the cantilever with chains, much much easier to tilt and tug and adjust when going in or out. But hey, some people like them. Hell, I used to teach for Chrysler and 3 of there engines are lifted with intake lift plates, couldn't get a tech to use them though.
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