273 rockers/lifters

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If you want hyd, you'll need cam and lifters but keep your adjustable rockers. But solid cam lifters and your adjustable rockers will allow it spin higher
 
^what he said. However I would add that you might wanna upgrade your adjuster and lock nuts.
 
Ok...do you have to adjust them often if primarily street cruising?

It depends on the condition of your rockers and adjusting screws. My 67 Cuda had one or two that needed to be adjust more than the rest (must have been looser).

Fresh adjusting screws or ones with locknuts as suggested earlier may be worth thinking about...
 
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