[bobcowan]

The 272 is probably your best bet. Plenty of power. But smooth idle and good vacuum signal for the carb. Should be a real nice ride.

Instead of roller rocker, I assume you mean roller lifter?

A retrofit cam will have exactly the same specs and performance. The differance is in the fit, not the operation of the cam.

For lifters, you have two options. You can use link bar hydraulic rollers with a 5.0/5.8 cam. A little expensive, but drop right in with no hassle.

You can also use stock Ford lifters with a retrofit cam. But, you need to drill the holes for the spider, and do a little grinding in the lifter valley so the dog bones sit flat.

The end results is exactly the same. Price is pretty close to the same, too.