I went with 1.7 rockers on the B1's and I think 1.65's on the 440-1 heads. The only other thing you may want to consider is if and when you want to step up to a different head are the pistons valve reliefs going to be OK. My pistons were Wiseco Pistons made for 440-1 heads so I had Tom Hemphill go ahead and cut them for my B1 heads so the engine was balanced and ready for the switch-over.