id recommend a 305 to 325 intake runner size.check ebay for "BBC HEADS" you can get a set pretty cheap.looks like your probably not going to be putting 600 hp nitrous load or equivilent extra cylinder pressure into the thing so id do the ebay.DONT BUY USED PARTS THOUGH!!!!buy new only!!!or learn the hard way,can i get an amen>>????lol.
cam with 260/266 at .050 will put you near your power band.call comp cams when ordering one.only thing that sux is comp doesent have many bbc cams off the shelf with 260 duration familys for bbc.maybe try chet herbert for a cam.he has a good selection and roller sticks are at 200 bucks.