360 build power estimates

A street striper huh? Hummm. This is a wide open feild. I'd skip the roller rockers. Theres a few pony's there, but it is not a cost effective gain. If you really want them, thats your call. Otherwise, a new set of MoPars HD stamped rockers would do fine.
No real extra HP in a electric pump as well. All though if you keep doing those little tricks, it'll add up.

I'd go 770 Avenger. A DP is a bit harder to get just right on a auto trans car. I would not do any more cfm. Carb choice is like what kind of undeware you would recomend. What ever feels good is what I say. I like old OE Carters myself. More so AVS carbs.

For a converter, I'd look into a Dynamic. (Though I'm not really an auto trans fella) They have a very good rep.
GoodysCuda is useing a PTC I think, and he likes it alot. Thats the other company I read alot of. People seem to like them alot.
Remember, quality counts on a converter big time. (Read...$$$)
I'm gonna guess and shoot for a 3,000 stall. With 4.10's and a 26-1/2 to 27 inch tire, as wide as you can stuff in there. Use with quality springs and/or Cal-tracs.

I'd also guess the same on the power est. figures.