Bobby,
With the stock pistons you will be limited to not a lot over .500 lift even with the dished pistons and OEM fly cut - that is unless you do some more fly cutting of the valve reliefs. My last 351 I stayed right at .512 and it was fairly close even with the fly cut hypereutectic pistons. Of course if you choose to replace those OEM pistons with something else, then the sky CAN be the limit. I do remember that you are trying to build on a reasonable budget, so do understand that your options become somewhat limited as to where you want to go.

As far as stock rockers - an out of the box Performer Plus will sound nice, run decently http://www.edelbrock.com/automotive_..._ford_sb.shtml Of course, some roller rockers........

AS far as HP3445's comments, he is correct if were building a race engine, not a streeter with a nice idle.